Fixed a weird bug with the in operator

Author: kyranet

package.json

@@ -1,6 +1,6 @@
 {
     "name": "canvas-constructor",
-    "version": "0.1.2",
+    "version": "0.1.3",
     "description": "A ES6 class for node-canvas with built-in functions and chained methods.",
     "main": "index.js",
     "scripts": {

src/canvas.js

@@ -82,7 +82,7 @@ class CanvasConstructor {
      * @chainable
      */
     addImage(buffer, x, y, width, height, options = {}) {
-        if ('type' in options) {
+        if (options.type) {
             if (options.type === 'round') return this.addRoundImage(buffer, x, y, width, height, options.radius);
             if (options.type === 'bevel') return this.addBevelImage(buffer, x, y, width, height, options.radius);
         }