build: fix JSON

Author: Ian Channing

.babelrc

@@ -4,7 +4,7 @@
     "@babel/preset-react"
   ],
   "plugins": [
-    ["@babel/plugin-proposal-class-properties", { "loose": true }],
+    ["@babel/plugin-proposal-class-properties", { "loose": true }]
   ],
   "env": {
     "test": {