Bump node-fetch from 1.7.3 to 2.6.1 (pubnub#199)

Bumps [node-fetch](https://github.com/bitinn/node-fetch) from 1.7.3 to 2.6.1.
- [Release notes](https://github.com/bitinn/node-fetch/releases)
- [Changelog](https://github.com/node-fetch/node-fetch/blob/master/docs/CHANGELOG.md)
- [Commits](node-fetch/node-fetch@1.7.3...v2.6.1)

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: raipubnub <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -103,7 +103,7 @@
     "karma-webpack": "^4.0.2",
     "mocha": "^7.1.2",
     "nock": "^9.6.1",
-    "node-fetch": "^1.7.3",
+    "node-fetch": "^2.6.1",
     "phantomjs-prebuilt": "^2.1.16",
     "puppeteer": "^5.2.0",
     "rimraf": "^3.0.2",