PEG.js grammar: Add missing semicolon

Fixes the following JSHint error:

  lib/parser.js: line 108, col 54, Missing semicolon.

lib/parser.js

@@ -105,7 +105,7 @@ module.exports = (function() {
         peg$c34 = function(expression) { return expression; },
         peg$c35 = void 0,
         peg$c36 = function(name) {
-              return { type: "rule_ref", name: name }
+              return { type: "rule_ref", name: name };
             },
         peg$c37 = function(operator, code) {
               return { type: OPS_TO_SEMANTIC_PREDICATE_TYPES[operator], code: code };

src/parser.pegjs

@@ -155,7 +155,7 @@ PrimaryExpression
 
 RuleReferenceExpression
   = name:IdentifierName !(__ (StringLiteral __)? "=") {
-      return { type: "rule_ref", name: name }
+      return { type: "rule_ref", name: name };
     }
 
 SemanticPredicateExpression