replace jest with ava

node_modules/core-util-is/package.json

@@ -1,32 +0,0 @@
-{
-  "name": "core-util-is",
-  "version": "1.0.2",
-  "description": "The `util.is*` functions introduced in Node v0.12.",
-  "main": "lib/util.js",
-  "repository": {
-    "type": "git",
-    "url": "git://github.com/isaacs/core-util-is"
-  },
-  "keywords": [
-    "util",
-    "isBuffer",
-    "isArray",
-    "isNumber",
-    "isString",
-    "isRegExp",
-    "isThis",
-    "isThat",
-    "polyfill"
-  ],
-  "author": "Isaac Z. Schlueter <i@izs.me> (http://blog.izs.me/)",
-  "license": "MIT",
-  "bugs": {
-    "url": "https://github.com/isaacs/core-util-is/issues"
-  },
-  "scripts": {
-    "test": "tap test.js"
-  },
-  "devDependencies": {
-    "tap": "^2.3.0"
-  }
-}