😒 chore(deps): Upgrade.

package.json

@@ -30,9 +30,9 @@
   "devDependencies": {
     "@aureooms/js-in-situ-sort-spec": "^7.0.2",
     "ava": "^3.7.1",
-    "coveralls": "^2.11.16",
+    "coveralls": "^3.0.14",
     "esdoc": "^1.1.0",
-    "nyc": "^11.0.1",
+    "nyc": "^15.0.1",
     "@babel/cli": "7.8.4",
     "@babel/core": "7.9.0",
     "@babel/polyfill": "7.8.7",
@@ -41,7 +41,7 @@
     "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": "http://aureooms.github.io/js-heapsort",
   "keywords": [