Loosen prettier dependency to use ~ instead of pinning versions

Resolves #374

Author: RyanZim

package.json

@@ -33,7 +33,7 @@
     "eslint-plugin-import": "^2.2.0",
     "eslint-plugin-prettier": "^2.2.0",
     "postcss-scss": "^2.0.0",
-    "prettier": "1.14.0",
+    "prettier": "~1.14.0",
     "sugarss": "^1.0.0"
   },
   "scripts": {