Update dependencies

[bobfang]

Updating package dependencies to remediate whitesource scan findings

• Using watchify to invoke browserify on the example app instead of using express-browserify (removed)
• Added npm-run-all to run watchify and server.js for example app in local development mode (old dev script didn't exist anyway)
• Updated mocha to latest version
• Updated nodeify-fetch to v2.2.2
  • This broke the recognize-file should transcribe files via URL test
  • Fixed test case in recognize-file.js related to nodeify-fetch API changes between v1.0.1 to v.2.2.2
• Removed npm from dependencies
• Updated main package.json version to 0.39.1
• Updated example package.json to require watson-speech ^0.39.0 so it pulls the latest available release (currently v0.39.0) and will receive update via v0.39.1 (this PR)

Checklist

• [x] npm test passes
• [x] changelog updated

Tests

Firefox 97.0 (Mac OS 10.15): Executed 42 of 42 SUCCESS (10.202 secs / 10.163 secs) TOTAL: 42 SUCCESS

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1 out of 2 committers have signed the CLA.

:white_check_mark: bobfang
:x: Bob Fang

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[bobfang]

had to re-do this because some commits didn't have the correct author and email