replace jest with ava

node_modules/well-known-symbols/README.md

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+# well-known-symbols
+
+Check whether a symbol is [well-known](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Symbol#Well-known_symbols).
+
+Requires Node.js 6 or above. Note that not all Node.js versions support the same
+well-known symbols.
+
+## Installation
+
+```console
+$ npm install --save well-known-symbols
+```
+
+## Usage
+
+```js
+const wellKnownSymbols = require('well-known-symbols')
+
+wellKnownSymbols.isWellKnown(Symbol.iterator) // true
+wellKnownSymbols.isWellKnown(Symbol()) // false
+
+wellKnownSymbols.getLabel(Symbol.iterator) // 'Symbol.iterator'
+wellKnownSymbols.getLabel(Symbol()) // undefined
+```