Add jshint to build

.jshintrc

@@ -0,0 +1,3 @@
+{
+    "esversion": 6
+}

README.md

@@ -41,6 +41,6 @@ Install [Node.js](https://nodejs.org/en/), v5 preferred.
 Install the required packages for the build:
 ```bash
 npm install gulp -g
-npm install gulp-sourcemaps gulp-babel babel-preset-es2015 gulp-uglify gulp-concat gulp-cssnano gulp-autoprefixer gulp-order del
+npm install gulp-sourcemaps gulp-babel babel-preset-es2015 gulp-uglify gulp-concat gulp-cssnano gulp-autoprefixer gulp-order del jshint gulp-jshint
 ```
 Build with `gulp`. Make a release folder with `gulp release`. For seamless development, auto-minify changed files with `gulp watch`.

gulpfile.js

@@ -7,6 +7,7 @@ var minifyCSS = require('gulp-cssnano');
 var autoprefixer = require('gulp-autoprefixer');
 var order = require("gulp-order");
 var del = require('del');
+var jshint = require('gulp-jshint');
 
 gulp.task('default', ['css', 'mp3', 'minify'], function() {
     
@@ -40,8 +41,8 @@ gulp.task("mp3", function () {
 gulp.task("minify", function () {
   return gulp.src("src/js/*.js")
     // Enable later
-    //.pipe(jshint('.jshintrc'))
-    //.pipe(jshint.reporter('default'))
+    .pipe(jshint('.jshintrc'))
+    .pipe(jshint.reporter('default'))
     .pipe(sourcemaps.init())
     .pipe(babel())
     .pipe(uglify())