Remove syntax-trailing-function-commas from Babel presets (#6513)

packages/babel-preset-es2017/package.json

@@ -8,7 +8,6 @@
   "repository": "https://github.com/babel/babel/tree/master/packages/babel-preset-es2017",
   "main": "lib/index.js",
   "dependencies": {
-    "babel-plugin-syntax-trailing-function-commas": "7.0.0-beta.0",
     "@babel/plugin-transform-async-to-generator": "7.0.0-beta.3"
   }
 }

packages/babel-preset-es2017/src/index.js

@@ -1,8 +1,7 @@
-import syntaxTrailingFunctionCommas from "babel-plugin-syntax-trailing-function-commas";
 import transformAsyncToGenerator from "@babel/plugin-transform-async-to-generator";
 
 export default function() {
   return {
-    plugins: [syntaxTrailingFunctionCommas, transformAsyncToGenerator],
+    plugins: [transformAsyncToGenerator],
   };
 }