build: update dep dev

Author: Scrum

package-lock.json

@@ -18,11 +18,11 @@
     "fclone": "^1.0.11"
   },
   "devDependencies": {
-    "ava": "^3.6.0",
-    "coveralls": "^3.0.11",
+    "ava": "^3.8.1",
+    "coveralls": "^3.1.0",
     "jsdoc-to-markdown": "^5.0.0",
     "nyc": "^15.0.1",
-    "posthtml": "^0.12.0",
+    "posthtml": "^0.13.0",
     "standard": "^14.3.3",
     "standard-changelog": "^2.0.11"
   },