Some cleanup

src/js/parser/javascript/match.js

@@ -11,7 +11,7 @@ export default _.extend({}, Base, {
 
     if (this.anchor_start()) {
       this.contents.anchor_start = this.render_label(this.container, 'Start of line')
-        .attr({ 'class': 'anchor' });
+        .addClass('anchor');
     }
 
     this.contents.parts = _.map(this.parts(), function(part) {
@@ -22,7 +22,7 @@ export default _.extend({}, Base, {
 
     if (this.anchor_end()) {
       this.contents.anchor_end = this.render_label(this.container, 'End of line')
-        .attr({ 'class': 'anchor' });
+        .addClass('anchor');
     }
   },