release 2.2.0

Author: chenjiahan

index.js

@@ -2,7 +2,7 @@ const acorn = require('acorn');
 const escodegen = require('escodegen');
 
 module.exports = function(source) {
-    this.cacheable();
+    this.cacheable && this.cacheable();
     const tree = acorn.parse(source, { sourceType: 'module' });
     traverse(tree);
     return escodegen.generate(tree);

package.json

@@ -1,6 +1,6 @@
 {
   "name": "template-string-optimize-loader",
-  "version": "2.1.0",
+  "version": "2.2.0",
   "description": "template string optimize loader module for webpack",
   "main": "index.js",
   "scripts": {