Rename production eslint file from .eslintrcProd to .eslint.production.json as per suggestion from @swalkinshaw: https://github.com/roots/sage/pull/2008#issuecomment-352520506

.eslintrc.production.json

@@ -0,0 +1,8 @@
+{
+  "extends": [
+    "./package.json"
+  ],
+  "rules": {
+      "no-console": ["error"]
+  }
+}