Prevent manually updating sizes-*.json (#58)

* setup size-plugin-bot

* update rollup-plugin-size version

* add build script to travis config

* avoid updating size*.json on local build

* Update .travis.yml

* add check to write file(sizes*.json) in CI

* Update .travis.yml

Author: kuldeepkeshwar

rollup.config.js

@@ -15,7 +15,7 @@ export default [
       sourcemap: true,
     },
     plugins: [external(), babel(), resolve(), commonjs(),
-      size({publish:true,exclude:pkg.module,filename:'sizes-cjs.json'}),
+      size({publish:true,exclude:pkg.module,filename:'sizes-cjs.json',writeFile:process.env.CI?true:false}),
       sizeSnapshot()],
   },
   {
@@ -26,7 +26,7 @@ export default [
       sourcemap: true,
     },
     plugins: [external(), babel(),
-      size({publish:true,exclude:pkg.main,filename:'sizes-es.json'}),
+      size({publish:true,exclude:pkg.main,filename:'sizes-es.json',writeFile:process.env.CI?true:false}),
       sizeSnapshot()],
   },
 ]