Update dependencies

[lumaxis]

I only did superficial testing, ran the build and test and ran our project's test suite against this version of testdouble. There are two major version updates:

1. nyc: Tested npm run cover and everything seems to still work
2. standard: Version 13.0.0 dropped support for Node 6 but is supposed to silently pass for compatibility reasons. Not sure if this is a blocker for upgrading or not.

[lumaxis]

Looks like the build fails with a lint issue:

standard: Use JavaScript Standard Style (https://standardjs.com)
  /Users/lukas/Work/oss/testdouble.js/src/object/proxy.ts:33:15: Do not access Object.prototype method 'hasOwnProperty' from target object.
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! testdouble@3.12.1 style:ts: `standard --fix --parser @typescript-eslint/parser --plugin @typescript-eslint/eslint-plugin "**/*.ts"`
npm ERR! Exit status 1

I'll see if I can fix that tomorrow.

[searls]

Landed in 3.12.2

[lumaxis]

@searls Awesome, thanks for pushing this over the finish line! 🙏🏼

[searls]

Thanks for the push <3