replace jest with ava

node_modules/lowercase-keys/readme.md

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+# lowercase-keys [![Build Status](https://travis-ci.org/sindresorhus/lowercase-keys.svg?branch=master)](https://travis-ci.org/sindresorhus/lowercase-keys)
+
+> Lowercase the keys of an object
+
+
+## Install
+
+```
+$ npm install --save lowercase-keys
+```
+
+
+## Usage
+
+```js
+var lowercaseKeys = require('lowercase-keys');
+
+lowercaseKeys({FOO: true, bAr: false});
+//=> {foo: true, bar: false}
+```
+
+
+## API
+
+### lowercaseKeys(object)
+
+Lowercases the keys and returns a new object.
+
+
+
+## License
+
+MIT © [Sindre Sorhus](http://sindresorhus.com)