nyc@14 update in devDependencies

resolves a non-production npm audit issue
diff --git a/package.json b/package.json
index d43c55c..d4f5a58 100644
--- a/package.json
+++ b/package.json
@@ -43,7 +43,7 @@
     "eslint-plugin-standard": "^4.0.0",
     "fs-extra": "^8.1.0",
     "jasmine": "3.1.0",
-    "nyc": "^13.1.0",
+    "nyc": "^14.1.1",
     "rewire": "^4.0.1"
   },
   "engines": {