fix(package): update chalk to version 2.0.0

Author: greenkeeper[bot]

package.json

@@ -23,7 +23,7 @@
     "url": "https://github.com/aureooms/js-red-black-tree/issues"
   },
   "dependencies": {
-    "chalk": "^1.1.3"
+    "chalk": "^2.0.0"
   },
   "devDependencies": {
     "@aureooms/js-compare": "^1.4.5",