update nyc to 15.1.0 in all package.json file (open-telemetry#1140)

Author: shivkanya9146

api/package.json

@@ -68,7 +68,7 @@
     "karma-webpack": "^4.0.2",
     "linkinator": "^2.0.3",
     "mocha": "^7.1.2",
-    "nyc": "^15.0.0",
+    "nyc": "^15.1.0",
     "ts-loader": "^6.0.4",
     "ts-mocha": "^7.0.0",
     "typedoc": "^0.15.0",

api/packages/opentelemetry-context-base/package.json

@@ -48,7 +48,7 @@
     "codecov": "^3.6.1",
     "gts": "^2.0.0",
     "mocha": "^7.1.2",
-    "nyc": "^15.0.0",
+    "nyc": "^15.1.0",
     "rimraf": "^3.0.0",
     "ts-mocha": "^7.0.0",
     "ts-node": "^8.6.2",