Fixed #25, update dev & devDep

Author: Ivan Demidov

package.json

@@ -25,12 +25,12 @@
   },
   "homepage": "https://github.com/GitScrum/posthtml-cli#readme",
   "dependencies": {
-    "posthtml": "^0.8.1",
-    "yargs": "^4.1.0"
+    "posthtml": "^0.8.3",
+    "yargs": "^4.2.0"
   },
   "devDependencies": {
-    "ava": "^0.11.0",
-    "nyc": "^5.5.0",
+    "ava": "^0.12.0",
+    "nyc": "^6.0.0",
     "xo": "^0.12.1"
   }
 }