update canvas dependency to a more secure version

Author: foo123

package.json

@@ -1,13 +1,13 @@
 {
   "name": "HAAR.js",
-  "version": "0.4.6",
+  "version": "0.4.8",
   "description": "HAAR.js Feature Detection Library for JavaScript and Node based on Viola-Jones algorithm",
   "main": "build/haar-detector.min.js",
   "directories": {
     "example": "examples"
   },
   "dependencies": {
-    "canvas": "~0.13.1"
+    "canvas": "~1.6.10"
   },
   "devDependencies": {},
   "scripts": {