chore(bower): remove bower version number

Bower uses tags, version number doesn't need to be specified.

Closes angular-ui#1521

Author: user378230

bower.json

@@ -1,6 +1,5 @@
 {
-  "name": "angular-ui-select",
-  "version": "0.17.0",
+  "name": "angular-ui-select",  
   "homepage": "https://github.com/angular-ui/ui-select",
   "authors": [
     "AngularUI"

gulpfile.js

@@ -118,7 +118,7 @@ gulp.task('recommendedBump', function(done) {
 
   conventionalRecommendedBump({preset: 'angular'}, function(err, importance) {
     // Get all the files to bump version in
-    gulp.src(['./package.json', './bower.json'])
+    gulp.src(['./package.json'])
       .pipe($.bump({type: importance}))
       .pipe(gulp.dest('./'));