gulpfile updated

gulpfile.js

@@ -3,7 +3,6 @@
 'use strict';
 var { task } = require('gulp');
 var fs = require('fs');
-var exec = require('child_process').exec;
 const util = require('util');
 const promisifyExec = util.promisify(require('child_process').exec);
 
@@ -13,7 +12,7 @@ task('publishTag', async function () {
     await promisifyExec("git tag v"+ packageJSON.version +"; git push --tags");
 });
 
-task('updateChangelog', async function update() {
+task('updateChangelog', async function () {
     let previous_version = process.argv[4];
     let next_version = "v" + packageJSON.version;
     await promisifyExec("github-changes -o ethereum -r remix -a --file changes.md --only-pulls --use-commit-body --only-merges --between-tags " + previous_version + "..." + next_version);