Drop built-in Flow type definition

I don't want to be responsible for maintaining it.

Submit it to https://github.com/flow-typed/flow-typed if you need it.

Author: sindresorhus

.flowconfig

@@ -8,14 +8,13 @@
 		"node": ">=8"
 	},
 	"scripts": {
-		"test": "xo && nyc ava && tsd && flow",
+		"test": "xo && nyc ava && tsd",
 		"bench": "matcha benchmark.js"
 	},
 	"files": [
 		"index.js",
 		"templates.js",
-		"index.d.ts",
-		"index.js.flow"
+		"index.d.ts"
 	],
 	"keywords": [
 		"color",
@@ -50,17 +49,11 @@
 		"ava": "^1.4.1",
 		"coveralls": "^3.0.3",
 		"execa": "^1.0.0",
-		"flow-bin": "^0.98.0",
 		"import-fresh": "^3.0.0",
 		"matcha": "^0.7.0",
 		"nyc": "^14.0.0",
 		"resolve-from": "^5.0.0",
 		"tsd": "^0.7.2",
 		"xo": "^0.24.0"
-	},
-	"xo": {
-		"ignores": [
-			"test/_flow.js"
-		]
 	}
 }

index.js.flow

@@ -9,7 +9,7 @@
 
 > Terminal string styling done right
 
-[![Build Status](https://travis-ci.org/chalk/chalk.svg?branch=master)](https://travis-ci.org/chalk/chalk) [![Coverage Status](https://coveralls.io/repos/github/chalk/chalk/badge.svg?branch=master)](https://coveralls.io/github/chalk/chalk?branch=master) [![npm dependents](https://badgen.net/npm/dependents/chalk)](https://www.npmjs.com/package/chalk?activeTab=dependents) [![Downloads](https://badgen.net/npm/dt/chalk)](https://www.npmjs.com/package/chalk) [![](https://img.shields.io/badge/unicorn-approved-ff69b4.svg)](https://www.youtube.com/watch?v=9auOCbH5Ns4) [![XO code style](https://img.shields.io/badge/code_style-XO-5ed9c7.svg)](https://github.com/xojs/xo) ![TypeScript- and Flow-ready](https://img.shields.io/npm/types/chalk.svg)
+[![Build Status](https://travis-ci.org/chalk/chalk.svg?branch=master)](https://travis-ci.org/chalk/chalk) [![Coverage Status](https://coveralls.io/repos/github/chalk/chalk/badge.svg?branch=master)](https://coveralls.io/github/chalk/chalk?branch=master) [![npm dependents](https://badgen.net/npm/dependents/chalk)](https://www.npmjs.com/package/chalk?activeTab=dependents) [![Downloads](https://badgen.net/npm/dt/chalk)](https://www.npmjs.com/package/chalk) [![](https://img.shields.io/badge/unicorn-approved-ff69b4.svg)](https://www.youtube.com/watch?v=9auOCbH5Ns4) [![XO code style](https://img.shields.io/badge/code_style-XO-5ed9c7.svg)](https://github.com/xojs/xo) ![TypeScript-ready](https://img.shields.io/npm/types/chalk.svg)
 
 <img src="https://cdn.jsdelivr.net/gh/chalk/ansi-styles@8261697c95bf34b6c7767e2cbe9941a851d59385/screenshot.svg" width="900">