[npm] upgrade babel-eslint

[spalger]

babel-eslint includes a fix for babel/babel-eslint#243

[epixa]

LGTM on green build

[elasticsearch-bot]

Spencer Alger merged this into the following branches!

Branch	Commits
4.x	e5615c9, ebf954a
4.4	33c6c5b, e7ff930
4.3	0fa7c90, ec509d6

[jmm]

You probably don't want to change it back now just for this, but FWIW this should be good re: 758c597:

--- a/tasks/build/downloadNodeBuilds.js
+++ b/tasks/build/downloadNodeBuilds.js
@@ -37,7 +37,7 @@ module.exports = function (grunt) {
     // use an async iife to store promise for download
     // then store platform in active downloads list
     // which we will read from in the finish task
-    platform.downloadPromise = (async function () {
+    platform.downloadPromise = (async () => {
       grunt.file.mkdir(downloadDir);

       if (platform.name === 'windows') {
@@ -61,7 +61,7 @@ module.exports = function (grunt) {
       await fromNode(cb => {
         rename(downloadDir, finalDir, cb);
       });
-    }());
+    })();

     activeDownloads.push(platform);