Update dependencies

Author: Joris-van-der-Wel

package.json

@@ -61,7 +61,7 @@
     "mocha": "^6.0.2",
     "mocha-sugar-free": "^1.3.1",
     "morgan": "^1.9.0",
-    "nyc": "^13.1.0",
+    "nyc": "^14.1.1",
     "serve-index": "^1.9.1",
     "sinon": "^7.1.1",
     "throttle": "^1.0.3"
@@ -79,9 +79,9 @@
     "cjson": "^0.5.0",
     "deep-store": "1.1.0",
     "error-stack-parser": "^2.0.1",
-    "fs-extra": "^7.0.0",
+    "fs-extra": "^8.1.0",
     "istanbul-lib-instrument": "^3.0.0",
-    "jsdom": "^14.0.0",
+    "jsdom": "^15.1.1",
     "jsonbird": ">= 3.1.0 < 4",
     "jsonbird-websocket": "^1.0.0",
     "performr-runner-metadata-parser": "^1.0.0",
@@ -91,8 +91,8 @@
     "shortid": "^2.2.8",
     "split": "^1.0.1",
     "symbol-tree": "^3.2.2",
-    "ws": "^6.0.0",
-    "yargs": "^13.2.2"
+    "ws": "^7.1.2",
+    "yargs": "^14.0.0"
   },
   "optionalDependencies": {
     "appdmg": "^0.5.2"