replaced bluebird with any-promise to allow consumers of the library to choose their promise implementation

index.js

@@ -12,7 +12,7 @@ const Template = require('./src/parser');
 const Expression = require('./src/expression.js');
 const tags = require('./tags');
 const filters = require('./filters');
-const Promise = require("bluebird");
+const Promise = require('any-promise');
 
 var _engine = {
     init: function(tag, filter, options) {

package.json

@@ -23,7 +23,7 @@
   },
   "homepage": "https://github.com/harttle/shopify-liquid#readme",
   "dependencies": {
-    "bluebird": "^3.4.3",
+    "any-promise": "^1.3.0",
     "lodash": "^4.13.1",
     "strftime": "^0.9.2"
   },

src/render.js

@@ -1,7 +1,7 @@
 const error = require('./error.js');
 const Exp = require('./expression.js');
 const assert = require('assert');
-const Promise = require("bluebird");
+const Promise = require('any-promise');
 
 var render = {
 

tags/include.js

@@ -1,5 +1,5 @@
 var Liquid = require('..');
-var Promise = require("bluebird");
+var Promise = require('any-promise');
 var lexical = Liquid.lexical;
 var withRE = new RegExp(`with\\s+(${lexical.value.source})`);