Follow package.json dependency versioning consistently

Author: jonathantneal

package.json

@@ -27,7 +27,7 @@
   },
   "dependencies": {
     "postcss": "^6.0",
-    "postcss-values-parser": "^1.3.1"
+    "postcss-values-parser": "^1.3"
   },
   "devDependencies": {
     "babel-core": "^6.26",