fix(package.json): Upgraded outdated dependencies

Author: halfzebra

package.json

@@ -31,7 +31,7 @@
     "connect-history-api-fallback": "^1.5.0",
     "cross-spawn": "^6.0.5",
     "css-loader": "^0.28.9",
-    "dotenv": "^5.0.0",
+    "dotenv": "^6.0.0",
     "elm": "~0.18.0",
     "elm-hot-loader": "0.5.4",
     "elm-test": "^0.18.12",
@@ -67,7 +67,7 @@
     "husky": "^0.14.3",
     "lint-staged": "^7.0.0",
     "mocha": "^5.0.1",
-    "nightmare": "^2.10.0",
+    "nightmare": "^3.0.1",
     "prettier": "^1.10.2",
     "rimraf": "^2.6.2",
     "semantic-release": "12.1.1",