Upgrade nyc and coveralls to latest

Author: jgonggrijp

package-lock.json

@@ -50,7 +50,7 @@
     "./package.json": "./package.json"
   },
   "devDependencies": {
-    "coveralls": "^2.11.2",
+    "coveralls": "^3.1.1",
     "cpy-cli": "^3.1.1",
     "docco": "^0.8.0",
     "eslint": "^6.8.0",
@@ -61,7 +61,7 @@
     "karma": "^4.4.1",
     "karma-qunit": "^4.1.2",
     "karma-sauce-launcher": "^4.3.6",
-    "nyc": "^2.1.3",
+    "nyc": "^15.1.0",
     "pretty-bytes-cli": "^1.0.0",
     "qunit": "2.10.1",
     "rollup": "^2.40.0",