add sourcemap: true option to sass call

Author: kwolniak

README.md

@@ -103,7 +103,7 @@ var filter = require('gulp-filter');
 
 gulp.task('sass', function () {
  gulp.src('scss/styles.scss')
- .pipe(sass({includePaths: ['scss']}))
+ .pipe(sass({includePaths: ['scss'], sourcemap: true}))
  .pipe(gulp.dest('css'))
  .pipe(filter('**/*.css')) // Filtering stream to only css files
  .pipe(browserSync.reload({stream:true}));