Merge pull request #1145 from ripple/dependabot/npm_and_yarn/nyc-15.0.0

Bump nyc from 14.1.1 to 15.0.0

package.json

@@ -46,7 +46,7 @@
     "json-schema-to-markdown-table": "^0.4.0",
     "mocha": "6.2.2",
     "mocha-junit-reporter": "^1.9.1",
-    "nyc": "^14.1.1",
+    "nyc": "^15.0.0",
     "prettier": "^1.19.1",
     "ts-node": "^8.4.1",
     "typescript": "^3.6.4",