renovate: unpin versions

package.json

@@ -26,33 +26,33 @@
     "tslib": "^1.9.3"
   },
   "devDependencies": {
-    "@types/chai": "4.1.7",
-    "@types/dirty-chai": "2.0.0",
-    "@types/mocha": "5.2.7",
-    "@types/node": "12.0.12",
-    "@types/nodemailer": "6.2.0",
-    "@types/smtp-server": "3.5.1",
-    "chai": "4.2.0",
-    "coveralls": "3.0.4",
-    "cross-env": "5.2.0",
-    "dirty-chai": "2.0.1",
-    "eslint": "6.0.1",
-    "eslint-config-prettier": "6.0.0",
-    "eslint-plugin-import": "2.18.0",
-    "eslint-plugin-node": "9.1.0",
-    "eslint-plugin-promise": "4.2.1",
-    "markdownlint-cli": "0.17.0",
-    "mocha": "6.1.4",
-    "nyc": "14.1.1",
-    "prettier": "1.18.2",
-    "promise-readable": "4.2.1",
-    "promise-socket": "5.0.0",
-    "shx": "0.3.2",
-    "smtp-server-as-promised": "5.2.2",
-    "ts-node": "8.3.0",
-    "tslint": "5.18.0",
-    "tslint-config-prettier": "1.18.0",
-    "typescript": "3.5.2"
+    "@types/chai": "^4.1.7",
+    "@types/dirty-chai": "^2.0.0",
+    "@types/mocha": "^5.2.7",
+    "@types/node": "^12.0.12",
+    "@types/nodemailer": "^6.2.0",
+    "@types/smtp-server": "^3.5.1",
+    "chai": "^4.2.0",
+    "coveralls": "^3.0.4",
+    "cross-env": "^5.2.0",
+    "dirty-chai": "^2.0.1",
+    "eslint": "^6.0.1",
+    "eslint-config-prettier": "^6.0.0",
+    "eslint-plugin-import": "^2.18.0",
+    "eslint-plugin-node": "^9.1.0",
+    "eslint-plugin-promise": "^4.2.1",
+    "markdownlint-cli": "^0.17.0",
+    "mocha": "^6.1.4",
+    "nyc": "^14.1.1",
+    "prettier": "^1.18.2",
+    "promise-readable": "^4.2.1",
+    "promise-socket": "^5.0.0",
+    "shx": "^0.3.2",
+    "smtp-server-as-promised": "^5.2.2",
+    "ts-node": "^8.3.0",
+    "tslint": "^5.18.0",
+    "tslint-config-prettier": "^1.18.0",
+    "typescript": "^3.5.2"
   },
   "scripts": {
     "compile": "tsc --pretty --project .",

renovate.json

@@ -1,5 +1,4 @@
 {
-  "extends": [
-    "config:base"
-  ]
+  "extends": ["config:base"],
+  "rangeStrategy": "bump"
 }