diff --git a/.eslintrc b/.eslintrc
index 5e524f4..11a35c3 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -2,6 +2,8 @@
   "extends": "airbnb-base",
   "env": { "jest": true },
   "rules": {
-    "no-underscore-dangle": "off"
+    "no-underscore-dangle": "off",
+    "arrow-parens": ["error", "as-needed", { "requireForBlockBody": true }],
+    "max-classes-per-file": "off"
   }
 }
diff --git a/package-lock.json b/package-lock.json
index d1d3aba..781a6a9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,36 +5,42 @@
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   "dependencies": {
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-      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0.tgz",
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+      "version": "7.5.5",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.5.5.tgz",
+      "integrity": "sha512-27d4lZoomVyo51VegxI20xZPuSHusqbQag/ztrBC7wegWoQ1nLREPVSKSW8byhTlzTKyNE4ifaTA6lCp7JjpFw==",
       "dev": true,
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       }
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-      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.4.5.tgz",
-      "integrity": "sha512-OvjIh6aqXtlsA8ujtGKfC7LYWksYSX8yQcM8Ay3LuvVeQ63lcOKgoZWVqcpFwkd29aYU9rVx7jxhfhiEDV9MZA==",
-      "dev": true,
-      "requires": {
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-        "@babel/generator": "^7.4.4",
-        "@babel/helpers": "^7.4.4",
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-        "@babel/template": "^7.4.4",
-        "@babel/traverse": "^7.4.5",
-        "@babel/types": "^7.4.4",
+      "version": "7.6.0",
+      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.6.0.tgz",
+      "integrity": "sha512-FuRhDRtsd6IptKpHXAa+4WPZYY2ZzgowkbLBecEDDSje1X/apG7jQM33or3NdOmjXBKWGOg4JmSiRfUfuTtHXw==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.5.5",
+        "@babel/generator": "^7.6.0",
+        "@babel/helpers": "^7.6.0",
+        "@babel/parser": "^7.6.0",
+        "@babel/template": "^7.6.0",
+        "@babel/traverse": "^7.6.0",
+        "@babel/types": "^7.6.0",
         "convert-source-map": "^1.1.0",
         "debug": "^4.1.0",
         "json5": "^2.1.0",
-        "lodash": "^4.17.11",
+        "lodash": "^4.17.13",
         "resolve": "^1.3.2",
         "semver": "^5.4.1",
         "source-map": "^0.5.0"
       },
       "dependencies": {
+        "semver": {
+          "version": "5.7.1",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
+          "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==",
+          "dev": true
+        },
         "source-map": {
           "version": "0.5.7",
           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
@@ -44,14 +50,14 @@
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     "@babel/generator": {
-      "version": "7.4.4",
-      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.4.4.tgz",
-      "integrity": "sha512-53UOLK6TVNqKxf7RUh8NE851EHRxOOeVXKbK2bivdb+iziMyk03Sr4eaE9OELCbyZAAafAKPDwF2TPUES5QbxQ==",
+      "version": "7.6.0",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.6.0.tgz",
+      "integrity": "sha512-Ms8Mo7YBdMMn1BYuNtKuP/z0TgEIhbcyB8HVR6PPNYp4P61lMsABiS4A3VG1qznjXVCf3r+fVHhm4efTYVsySA==",
       "dev": true,
       "requires": {
-        "@babel/types": "^7.4.4",
+        "@babel/types": "^7.6.0",
         "jsesc": "^2.5.1",
-        "lodash": "^4.17.11",
+        "lodash": "^4.17.13",
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         "trim-right": "^1.0.1"
       },
@@ -100,20 +106,20 @@
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-      "resolved": "https://registry.npmjs.org/@babel/helpers/-/helpers-7.4.4.tgz",
-      "integrity": "sha512-igczbR/0SeuPR8RFfC7tGrbdTbFL3QTvH6D+Z6zNxnTe//GyqmtHmDkzrqDmyZ3eSwPqB/LhyKoU5DXsp+Vp2A==",
+      "version": "7.6.0",
+      "resolved": "https://registry.npmjs.org/@babel/helpers/-/helpers-7.6.0.tgz",
+      "integrity": "sha512-W9kao7OBleOjfXtFGgArGRX6eCP0UEcA2ZWEWNkJdRZnHhW4eEbeswbG3EwaRsnQUAEGWYgMq1HsIXuNNNy2eQ==",
       "dev": true,
       "requires": {
-        "@babel/template": "^7.4.4",
-        "@babel/traverse": "^7.4.4",
-        "@babel/types": "^7.4.4"
+        "@babel/template": "^7.6.0",
+        "@babel/traverse": "^7.6.0",
+        "@babel/types": "^7.6.0"
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     "@babel/highlight": {
-      "version": "7.0.0",
-      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.0.0.tgz",
-      "integrity": "sha512-UFMC4ZeFC48Tpvj7C8UgLvtkaUuovQX+5xNWrsIoMG8o2z+XFKjKaN9iVmS84dPwVN00W4wPmqvYoZF3EGAsfw==",
+      "version": "7.5.0",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.5.0.tgz",
+      "integrity": "sha512-7dV4eu9gBxoM0dAnj/BCFDW9LFU0zvTrkq0ugM7pnHEgguOEeOz1so2ZghEdzviYzQEED0r4EAgpsBChKy1TRQ==",
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@@ -122,9 +128,9 @@
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-      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.4.5.tgz",
-      "integrity": "sha512-9mUqkL1FF5T7f0WDFfAoDdiMVPWsdD1gZYzSnaXsxUCUqzuch/8of9G3VUSNiZmMBoRxT3neyVsqeiL/ZPcjew==",
+      "version": "7.6.0",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.6.0.tgz",
+      "integrity": "sha512-+o2q111WEx4srBs7L9eJmcwi655eD8sXniLqMB93TBK9GrNzGrxDWSjiqz2hLU0Ha8MTXFIP0yd9fNdP+m43ZQ==",
       "dev": true
     },
     "@babel/plugin-syntax-object-rest-spread": {
@@ -137,41 +143,41 @@
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-      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.4.4.tgz",
-      "integrity": "sha512-CiGzLN9KgAvgZsnivND7rkA+AeJ9JB0ciPOD4U59GKbQP2iQl+olF1l76kJOupqidozfZ32ghwBEJDhnk9MEcw==",
+      "version": "7.6.0",
+      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.6.0.tgz",
+      "integrity": "sha512-5AEH2EXD8euCk446b7edmgFdub/qfH1SN6Nii3+fyXP807QRx9Q73A2N5hNwRRslC2H9sNzaFhsPubkS4L8oNQ==",
       "dev": true,
       "requires": {
         "@babel/code-frame": "^7.0.0",
-        "@babel/parser": "^7.4.4",
-        "@babel/types": "^7.4.4"
+        "@babel/parser": "^7.6.0",
+        "@babel/types": "^7.6.0"
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     "@babel/traverse": {
-      "version": "7.4.5",
-      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.4.5.tgz",
-      "integrity": "sha512-Vc+qjynwkjRmIFGxy0KYoPj4FdVDxLej89kMHFsWScq999uX+pwcX4v9mWRjW0KcAYTPAuVQl2LKP1wEVLsp+A==",
+      "version": "7.6.0",
+      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.6.0.tgz",
+      "integrity": "sha512-93t52SaOBgml/xY74lsmt7xOR4ufYvhb5c5qiM6lu4J/dWGMAfAh6eKw4PjLes6DI6nQgearoxnFJk60YchpvQ==",
       "dev": true,
       "requires": {
-        "@babel/code-frame": "^7.0.0",
-        "@babel/generator": "^7.4.4",
+        "@babel/code-frame": "^7.5.5",
+        "@babel/generator": "^7.6.0",
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         "@babel/helper-split-export-declaration": "^7.4.4",
-        "@babel/parser": "^7.4.5",
-        "@babel/types": "^7.4.4",
+        "@babel/parser": "^7.6.0",
+        "@babel/types": "^7.6.0",
         "debug": "^4.1.0",
         "globals": "^11.1.0",
-        "lodash": "^4.17.11"
+        "lodash": "^4.17.13"
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-      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.4.4.tgz",
-      "integrity": "sha512-dOllgYdnEFOebhkKCjzSVFqw/PmmB8pH6RGOWkY4GsboQNd47b1fBThBSwlHAq9alF9vc1M3+6oqR47R50L0tQ==",
+      "version": "7.6.1",
+      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.6.1.tgz",
+      "integrity": "sha512-X7gdiuaCmA0uRjCmRtYJNAVCc/q+5xSgsfKJHqMN4iNLILX39677fJE1O40arPMh0TTtS9ItH67yre6c7k6t0g==",
       "dev": true,
       "requires": {
         "esutils": "^2.0.2",
-        "lodash": "^4.17.11",
+        "lodash": "^4.17.13",
         "to-fast-properties": "^2.0.0"
       }
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@@ -186,101 +192,85 @@
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-      "resolved": "https://registry.npmjs.org/@jest/console/-/console-24.7.1.tgz",
-      "integrity": "sha512-iNhtIy2M8bXlAOULWVTUxmnelTLFneTNEkHCgPmgd+zNwy9zVddJ6oS5rZ9iwoscNdT5mMwUd0C51v/fSlzItg==",
+      "version": "24.9.0",
+      "resolved": "https://registry.npmjs.org/@jest/console/-/console-24.9.0.tgz",
+      "integrity": "sha512-Zuj6b8TnKXi3q4ymac8EQfc3ea/uhLeCGThFqXeC8H9/raaH8ARPUTdId+XyGd03Z4In0/VjD2OYFcBF09fNLQ==",
       "dev": true,
       "requires": {
-        "@jest/source-map": "^24.3.0",
+        "@jest/source-map": "^24.9.0",
         "chalk": "^2.0.1",
         "slash": "^2.0.0"
       }
     },
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-      "version": "24.8.0",
-      "resolved": "https://registry.npmjs.org/@jest/core/-/core-24.8.0.tgz",
-      "integrity": "sha512-R9rhAJwCBQzaRnrRgAdVfnglUuATXdwTRsYqs6NMdVcAl5euG8LtWDe+fVkN27YfKVBW61IojVsXKaOmSnqd/A==",
+      "version": "24.9.0",
+      "resolved": "https://registry.npmjs.org/@jest/core/-/core-24.9.0.tgz",
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-        "@jest/test-result": "^24.8.0",
-        "@jest/transform": "^24.8.0",
-        "@jest/types": "^24.8.0",
+        "@jest/reporters": "^24.9.0",
+        "@jest/test-result": "^24.9.0",
+        "@jest/transform": "^24.9.0",
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-        "jest-config": "^24.8.0",
-        "jest-haste-map": "^24.8.0",
-        "jest-message-util": "^24.8.0",
+        "jest-changed-files": "^24.9.0",
+        "jest-config": "^24.9.0",
+        "jest-haste-map": "^24.9.0",
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-        "jest-util": "^24.8.0",
-        "jest-validate": "^24.8.0",
-        "jest-watcher": "^24.8.0",
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+        "jest-resolve-dependencies": "^24.9.0",
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+        "jest-snapshot": "^24.9.0",
+        "jest-util": "^24.9.0",
+        "jest-validate": "^24.9.0",
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         "p-each-series": "^1.0.0",
-        "pirates": "^4.0.1",
         "realpath-native": "^1.1.0",
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+        "slash": "^2.0.0",
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-        "@jest/transform": "^24.8.0",
-        "@jest/types": "^24.8.0",
-        "jest-mock": "^24.8.0"
+        "@jest/fake-timers": "^24.9.0",
+        "@jest/transform": "^24.9.0",
+        "@jest/types": "^24.9.0",
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-      "resolved": "https://registry.npmjs.org/@jest/fake-timers/-/fake-timers-24.8.0.tgz",
-      "integrity": "sha512-2M4d5MufVXwi6VzZhJ9f5S/wU4ud2ck0kxPof1Iz3zWx6Y+V2eJrES9jEktB6O3o/oEyk+il/uNu9PvASjWXQw==",
+      "version": "24.9.0",
+      "resolved": "https://registry.npmjs.org/@jest/fake-timers/-/fake-timers-24.9.0.tgz",
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-        "jest-message-util": "^24.8.0",
-        "jest-mock": "^24.8.0"
+        "@jest/types": "^24.9.0",
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-      "version": "24.8.0",
-      "resolved": "https://registry.npmjs.org/@jest/reporters/-/reporters-24.8.0.tgz",
-      "integrity": "sha512-eZ9TyUYpyIIXfYCrw0UHUWUvE35vx5I92HGMgS93Pv7du+GHIzl+/vh8Qj9MCWFK/4TqyttVBPakWMOfZRIfxw==",
+      "version": "24.9.0",
+      "resolved": "https://registry.npmjs.org/@jest/reporters/-/reporters-24.9.0.tgz",
+      "integrity": "sha512-mu4X0yjaHrffOsWmVLzitKmmmWSQ3GGuefgNscUSWNiUNcEOSEQk9k3pERKEQVBb0Cnn88+UESIsZEMH3o88Gw==",
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-        "@jest/test-result": "^24.8.0",
-        "@jest/transform": "^24.8.0",
-        "@jest/types": "^24.8.0",
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+        "@jest/test-result": "^24.9.0",
+        "@jest/transform": "^24.9.0",
+        "@jest/types": "^24.9.0",
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@@ -288,22 +278,22 @@
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-        "jest-resolve": "^24.8.0",
-        "jest-runtime": "^24.8.0",
-        "jest-util": "^24.8.0",
+        "istanbul-reports": "^2.2.6",
+        "jest-haste-map": "^24.9.0",
+        "jest-resolve": "^24.9.0",
+        "jest-runtime": "^24.9.0",
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-        "node-notifier": "^5.2.1",
+        "node-notifier": "^5.4.2",
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-      "version": "24.3.0",
-      "resolved": "https://registry.npmjs.org/@jest/source-map/-/source-map-24.3.0.tgz",
-      "integrity": "sha512-zALZt1t2ou8le/crCeeiRYzvdnTzaIlpOWaet45lNSqNJUnXbppUUFR4ZUAlzgDmKee4Q5P/tKXypI1RiHwgag==",
+      "version": "24.9.0",
+      "resolved": "https://registry.npmjs.org/@jest/source-map/-/source-map-24.9.0.tgz",
+      "integrity": "sha512-/Xw7xGlsZb4MJzNDgB7PW5crou5JqWiBQaz6xyPd3ArOg2nfn/PunV8+olXbbEZzNl591o5rWKE9BRDaFAuIBg==",
       "dev": true,
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@@ -312,45 +302,46 @@
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-        "@jest/console": "^24.7.1",
-        "@jest/types": "^24.8.0",
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@@ -5757,23 +5703,21 @@
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-        "decamelize": "^1.2.0",
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-        "get-caller-file": "^1.0.1",
-        "os-locale": "^3.0.0",
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@@ -5796,9 +5740,9 @@
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diff --git a/package.json b/package.json
index be8b31c..c68c762 100644
--- a/package.json
+++ b/package.json
@@ -12,10 +12,10 @@
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-    "eslint-config-airbnb-base": "^13.1.0",
-    "eslint-plugin-import": "^2.18.0",
-    "jest": "^24.8.0"
+    "coveralls": "^3.0.6",
+    "eslint": "^6.3.0",
+    "eslint-config-airbnb-base": "^14.0.0",
+    "eslint-plugin-import": "^2.18.2",
+    "jest": "^24.9.0"
   }
 }