chore: update nyc dev dependency (#77)

diff --git a/package.json b/package.json
index fb617c1..f8de8fe 100644
--- a/package.json
+++ b/package.json
@@ -39,7 +39,7 @@
     "eslint-plugin-standard": "^4.0.0",
     "file-url": "^2.0.2",
     "jasmine": "^3.3.1",
-    "nyc": "^13.3.0",
+    "nyc": "^14.1.1",
     "rewire": "^4.0.1"
   },
   "scripts": {