😒 chore(deps-dev): Upgrade.

Author: make-github-pseudonymous-again

package.json

@@ -27,16 +27,16 @@
     "url": "https://github.com/aureooms/js-red-black-tree/issues"
   },
   "dependencies": {
-    "chalk": "^2.0.0"
+    "chalk": "^4.0.0"
   },
   "devDependencies": {
     "@aureooms/js-compare": "1.4.5",
     "@aureooms/js-itertools": "3.4.0",
     "@aureooms/js-random": "2.0.0",
     "ava": "3.7.1",
-    "coveralls": "2.13.3",
+    "coveralls": "3.0.14",
     "esdoc": "1.1.0",
-    "nyc": "11.9.0",
+    "nyc": "15.0.1",
     "@babel/cli": "7.8.4",
     "@babel/core": "7.9.0",
     "@babel/polyfill": "7.8.7",
@@ -45,7 +45,7 @@
     "esdoc-inject-script-plugin": "1.0.0",
     "esdoc-inject-style-plugin": "1.0.0",
     "esdoc-standard-plugin": "1.0.0",
-    "np": "6.2.1"
+    "np": "6.2.2"
   },
   "homepage": "https://aureooms.github.io/js-red-black-tree",
   "keywords": [