diff --git a/package-lock.json b/package-lock.json
index 1408c82..02f6591 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "python-range",
-  "version": "1.0.2",
+  "version": "1.0.4",
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@@ -57,6 +57,7 @@
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       "integrity": "sha1-DNkKVhCT810KmSVsIrcGlDP60Rc=",
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+      "optional": true,
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@@ -69,6 +70,12 @@
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       "dev": true
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+      "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-3.2.3.tgz",
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+    },
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@@ -672,6 +679,12 @@
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       "dev": true
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+      "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
+      "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
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+    },
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@@ -788,8 +801,7 @@
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       "integrity": "sha1-9lNNFRSCabIDUue+4m9QH5oZEpA=",
-      "dev": true,
-      "optional": true
+      "dev": true
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@@ -877,6 +889,21 @@
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       "dev": true
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+    "emoji-regex": {
+      "version": "7.0.3",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-7.0.3.tgz",
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+      "dev": true
+    },
+    "end-of-stream": {
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+      "resolved": "https://registry.npmjs.org/end-of-stream/-/end-of-stream-1.4.1.tgz",
+      "integrity": "sha512-1MkrZNvWTKCaigbn+W15elq2BB/L22nqrSY5DKlo3X6+vclJm8Bb5djXJBmEX6fS3+zCh/F4VBK5Z2KxJt4s2Q==",
+      "dev": true,
+      "requires": {
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@@ -1247,6 +1274,21 @@
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       "dev": true
     },
+    "execa": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/execa/-/execa-1.0.0.tgz",
+      "integrity": "sha512-adbxcyWV46qiHyvSp50TKt05tB4tK3HcmF7/nxfAdhnox83seTDbwnaqKO4sXRy7roHAIFqJP/Rw/AuEbX61LA==",
+      "dev": true,
+      "requires": {
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+        "get-stream": "^4.0.0",
+        "is-stream": "^1.1.0",
+        "npm-run-path": "^2.0.0",
+        "p-finally": "^1.0.0",
+        "signal-exit": "^3.0.0",
+        "strip-eof": "^1.0.0"
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@@ -1368,6 +1410,23 @@
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       }
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+      "resolved": "https://registry.npmjs.org/flat/-/flat-4.1.0.tgz",
+      "integrity": "sha512-Px/TiLIznH7gEDlPXcUD4KnBusa6kR6ayRUVcnEAbreRIuhkqow/mun59BuRXwoYk7ZQOLW1ZM05ilIvK38hFw==",
+      "dev": true,
+      "requires": {
+        "is-buffer": "~2.0.3"
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+      "dependencies": {
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+          "resolved": "https://registry.npmjs.org/is-buffer/-/is-buffer-2.0.3.tgz",
+          "integrity": "sha512-U15Q7MXTuZlrbymiz95PJpZxu8IlipAp4dtS3wOdgPXx3mqBnslrWU14kxfHB+Py/+2PVKSr37dMAgM2A4uArw==",
+          "dev": true
+        }
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+    },
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@@ -1473,12 +1532,14 @@
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           "version": "1.0.0",
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-          "dev": true
+          "dev": true,
+          "optional": true
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           "version": "1.1.11",
           "bundled": true,
           "dev": true,
+          "optional": true,
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@@ -1493,17 +1554,20 @@
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           "version": "1.1.0",
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+          "dev": true,
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           "version": "0.0.1",
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-          "dev": true
+          "dev": true,
+          "optional": true
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           "version": "1.1.0",
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-          "dev": true
+          "dev": true,
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@@ -1620,7 +1684,8 @@
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           "version": "2.0.3",
           "bundled": true,
-          "dev": true
+          "dev": true,
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@@ -1632,6 +1697,7 @@
           "version": "1.0.0",
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           "dev": true,
+          "optional": true,
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@@ -1646,6 +1712,7 @@
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           "dev": true,
+          "optional": true,
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@@ -1653,12 +1720,14 @@
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           "version": "0.0.8",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "minipass": {
           "version": "2.2.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
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@@ -1677,6 +1746,7 @@
           "version": "0.5.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
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@@ -1757,7 +1827,8 @@
         "number-is-nan": {
           "version": "1.0.1",
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-          "dev": true
+          "dev": true,
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@@ -1769,6 +1840,7 @@
           "version": "1.4.0",
           "bundled": true,
           "dev": true,
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@@ -1890,6 +1962,7 @@
           "version": "1.0.2",
           "bundled": true,
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@@ -1973,12 +2046,27 @@
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       "dev": true
     },
+    "get-caller-file": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-2.0.5.tgz",
+      "integrity": "sha512-DyFP3BM/3YHTQOCUL/w0OZHR0lpKeGrxotcHWcqNEdnltqFwXVfhEBQ94eIo34AfQpo0rGki4cyIiftY06h2Fg==",
+      "dev": true
+    },
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       "integrity": "sha1-6td0q+5y4gQJQzoGY2YCPdaIekE=",
       "dev": true
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+    "get-stream": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-4.1.0.tgz",
+      "integrity": "sha512-GMat4EJ5161kIy2HevLlr4luNjBgvmj413KaQA7jt4V8B4RDsfpHk7WQ9GVqfYyyx8OS/L66Kox+rJRNklLK7w==",
+      "dev": true,
+      "requires": {
+        "pump": "^3.0.0"
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@@ -2018,6 +2106,7 @@
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       "integrity": "sha1-gTg9ctsFT8zPUzbaqQLxgvbtuyg=",
       "dev": true,
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@@ -2124,9 +2213,9 @@
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-      "resolved": "https://registry.npmjs.org/he/-/he-1.1.1.tgz",
-      "integrity": "sha1-k0EP0hsAlzUVH4howvJx80J+I/0=",
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/he/-/he-1.2.0.tgz",
+      "integrity": "sha512-F/1DnUGPopORZi0ni+CvrCgHQ5FyEAHRLSApuYWMmrbSwoN2Mn/7k+Gl38gJnR7yyDZk6WLXwiGod1JOWNDKGw==",
       "dev": true
     },
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@@ -2275,6 +2364,12 @@
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       }
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+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/invert-kv/-/invert-kv-2.0.0.tgz",
+      "integrity": "sha512-wPVv/y/QQ/Uiirj/vh3oP+1Ww+AWehmi1g5fFWGPF6IpCBCDVrhgHRMvrLfdYcwDh3QJbGXDW4JAuzxElLSqKA==",
+      "dev": true
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-      "dev": true
+      "dev": true,
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@@ -2441,6 +2537,12 @@
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       "dev": true
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+    "is-stream": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/is-stream/-/is-stream-1.1.0.tgz",
+      "integrity": "sha1-EtSj3U5o4Lec6428hBc66A2RykQ=",
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@@ -2571,6 +2673,7 @@
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       "integrity": "sha1-MeohpzS6ubuw8yRm2JOupR5KPGQ=",
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@@ -2582,6 +2685,15 @@
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+      "dev": true,
+      "requires": {
+        "invert-kv": "^2.0.0"
+      }
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@@ -2651,6 +2763,52 @@
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       "dev": true
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+    "log-symbols": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/log-symbols/-/log-symbols-2.2.0.tgz",
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+      "dev": true,
+      "requires": {
+        "chalk": "^2.0.1"
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+      "dependencies": {
+        "ansi-styles": {
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+          "dev": true,
+          "requires": {
+            "color-convert": "^1.9.0"
+          }
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+        "chalk": {
+          "version": "2.4.2",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
+          "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^3.2.1",
+            "escape-string-regexp": "^1.0.5",
+            "supports-color": "^5.3.0"
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+        "has-flag": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
+          "integrity": "sha1-tdRU3CGZriJWmfNGfloH87lVuv0=",
+          "dev": true
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+        "supports-color": {
+          "version": "5.5.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
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+          "dev": true,
+          "requires": {
+            "has-flag": "^3.0.0"
+          }
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@@ -2661,7 +2819,8 @@
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       "integrity": "sha1-MKCy2jj3N3DoKUoNIuZiXtd9AJc=",
-      "dev": true
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@@ -2672,6 +2831,15 @@
         "js-tokens": "^3.0.0"
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+      "resolved": "https://registry.npmjs.org/map-age-cleaner/-/map-age-cleaner-0.1.3.tgz",
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+      "dev": true,
+      "requires": {
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@@ -2679,6 +2847,25 @@
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+      "dev": true,
+      "requires": {
+        "map-age-cleaner": "^0.1.1",
+        "mimic-fn": "^2.0.0",
+        "p-is-promise": "^2.0.0"
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+          "resolved": "https://registry.npmjs.org/mimic-fn/-/mimic-fn-2.1.0.tgz",
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@@ -2755,37 +2942,101 @@
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       "dev": true,
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+        "ansi-colors": "3.2.3",
         "browser-stdout": "1.3.1",
-        "commander": "2.15.1",
-        "debug": "3.1.0",
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-        "glob": "7.1.2",
+        "find-up": "3.0.0",
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-        "he": "1.1.1",
+        "he": "1.2.0",
+        "js-yaml": "3.13.1",
+        "log-symbols": "2.2.0",
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         "mkdirp": "0.5.1",
-        "supports-color": "5.4.0"
+        "ms": "2.1.1",
+        "node-environment-flags": "1.0.5",
+        "object.assign": "4.1.0",
+        "strip-json-comments": "2.0.1",
+        "supports-color": "6.0.0",
+        "which": "1.3.1",
+        "wide-align": "1.1.3",
+        "yargs": "13.2.2",
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-          "integrity": "sha512-VlfT9F3V0v+jr4yxPc5gg9s62/fIVWsd2Bk2iD435um1NlGMYdVCq+MjcXnhYq2icNOizHr1kK+5TI6H0Hy0ag==",
+        "ansi-regex": {
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+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
+          "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=",
           "dev": true
         },
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