Merge remote-tracking branch 'origin/greenkeeper-canvas-1.6.2'

package.json

@@ -34,7 +34,7 @@
     "node": "4.4.0"
   },
   "dependencies": {
-    "canvas": "^1.3.10",
+    "canvas": "^1.6.2",
     "crc": "~3.4.1",
     "ejs": "^2.5.2",
     "lwip": "~0.0.8",