[Refactor] use colors instead of chalk

bin.js

@@ -8,7 +8,7 @@ const getProjectTempDir = require('npm-lockfile/getProjectTempDir');
 const finder = require('find-package-json');
 const promisify = require('util.promisify');
 const semver = require('semver');
-const chalk = require('chalk');
+const colors = require('colors/safe');
 
 const path = require('path');
 const { existsSync } = require('fs');
@@ -46,7 +46,7 @@ if (npmIsGood && (hasPkgLock || hasShrink || isFix)) {
 	npx(parsed);
 } else {
 	if (!npmIsGood) {
-		console.log(chalk.blue(`npm is v${npmV}; we need ${npmNeeded}; installing npm in a temp dir...`));
+		console.log(colors.blue(`npm is v${npmV}; we need ${npmNeeded}; installing npm in a temp dir...`));
 	}
 	Promise.all([
 		getLockfile(pkg, undefined, { npmNeeded }),

package.json

@@ -35,7 +35,7 @@
 	},
 	"homepage": "https://github.com/ljharb/aud#readme",
 	"dependencies": {
-		"chalk": "^2.4.2",
+		"colors": "^1.4.0",
 		"find-package-json": "^1.2.0",
 		"fs-copy-file": "^2.1.2",
 		"libnpx": "^10.2.4",
@@ -62,11 +62,5 @@
 		"commitLimit": false,
 		"backfillLimit": false,
 		"hideCredit": true
-	},
-	"greenkeeper": {
-		"ignore": [
-			"chalk",
-			"semver"
-		]
 	}
 }