check if the current branch is master for both of bump and release tasks

gulpfile.js

@@ -43,22 +43,26 @@ gulp.task('coverage', ['jscover'], function () {
   .pipe(coveralls())
 })
 
-gulp.task('bump', function () {
-  var opts = {}
-  opts.type = getBumpType()
-  return gulp.src('./package.json')
-  .pipe(bump(opts))
-  .pipe(gulp.dest('./'))
+gulp.task('bump', function (done) {
+  releaseIfHeadOnMaster(function (err) {
+    if (err) {
+      done()
+      return
+    }
+    var opts = {}
+    opts.type = getBumpType()
+    return gulp.src('./package.json')
+    .pipe(bump(opts))
+    .pipe(gulp.dest('./'))
+    .on('end', done)
+  })
 })
 
 gulp.task('release', ['bump'], function (done) {
-  gitRev.branch(function (branch) {
-    if (branch !== 'master') {
-      var errorMsg = 'You must be on the master branch to make a new release!\n'
-      errorMsg += 'If you want to make a release candidate (RC), use the `prerelease` task instead.\n'
-      errorMsg += 'Tasks `release`... Aborting.'
-      console.error(chalk.red.bgWhite(errorMsg))
-      return done()
+  releaseIfHeadOnMaster(function (err) {
+    if (err) {
+      done()
+      return
     }
     var pkg = require('./package.json')
     var version = 'v' + pkg.version
@@ -84,6 +88,20 @@ gulp.task('watch', function () {
   gulp.watch([ './tests/**/*.js', './lib/**/*.js' ], ['test'])
 })
 
+function releaseIfHeadOnMaster (done) {
+  gitRev.branch(function (branch) {
+    if (branch !== 'master') {
+      var errorMsg = 'You must be on the master branch to make a new release!\n'
+      errorMsg += 'If you want to make a release candidate (RC), use the `prerelease` task instead.\n'
+      errorMsg += 'Tasks `release`... Aborting.'
+      console.error(chalk.red.bgWhite(errorMsg))
+      done(new Error())
+      return
+    }
+    done()
+  })
+}
+
 function getBumpType () {
   return argv.patch
   ? 'patch' : (argv.minor)