Bump wdio-screenshot for iOS screencaps without shadow (#44)

Author: zinserjan

package.json

@@ -40,7 +40,7 @@
     "lodash": "^4.13.1",
     "node-resemble-js": "0.0.5",
     "platform": "^1.3.1",
-    "wdio-screenshot": "^0.5.0"
+    "wdio-screenshot": "^0.6.0"
   },
   "devDependencies": {
     "babel-cli": "^6.9.0",