Re-enable the max-len ESLint rule. (#5265)

packages/babel-plugin-transform-react-jsx/src/index.js

@@ -1,5 +1,3 @@
-/* eslint max-len: 0 */
-
 import jsx from "babel-plugin-syntax-jsx";
 import helper from "babel-helper-builder-react-jsx";
 
@@ -31,7 +29,8 @@ export default function ({ types: t }) {
       if (matches) {
         id = matches[1];
         if (id === "React.DOM") {
-          throw file.buildCodeFrameError(comment, "The @jsx React.DOM pragma has been deprecated as of React 0.12");
+          throw file.buildCodeFrameError(comment,
+            "The @jsx React.DOM pragma has been deprecated as of React 0.12");
         } else {
           break;
         }