Remove comments in JSON.

tsconfig.json

 {
   "compilerOptions": {
-    // this aligns with Vue's browser support
     "target": "es5",
-    // this enables stricter inference for data properties on `this`
     "strict": true,
-    // if using webpack 2+ or rollup, to leverage tree shaking:
     "module": "es2015",
     "moduleResolution": "node"
   }