feat: async pathRewrite

[rsethc]

Related issue: #374

[ghost]

DeepCode's analysis on #478d9b found:

• ❌ 0 critical issues. ⚠️ 0 warnings and 1 minor issue. ✔️ 0 issues were fixed.

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[coveralls]

Coverage remained the same at 87.778% when pulling 478d9bb on rsethc:master into 483911a on chimurai:master.

[chimurai]

Nice. Looks good.

The following needs to be in place before this PR can be accepted:

• Updated documentation README.md
• unit test(s) for pathRewriter
• unit test types.spec.ts (testing for the async syntax)

You can have a look at:
Similar PR, but for async router: https://github.com/chimurai/http-proxy-middleware/pull/379/files

Unit tests for path rewriter:
https://github.com/chimurai/http-proxy-middleware/blob/master/test/unit/path-rewriter.spec.ts

Types test:
https://github.com/chimurai/http-proxy-middleware/blob/master/test/types.spec.ts
example of async router: https://github.com/chimurai/http-proxy-middleware/blob/master/test/types.spec.ts#L74

[rsethc]

Alright, I'll take a look at solving these requirements. Thanks

[rsethc]

I think this is ready to have another look. One change I made by accident affected the yarn.lock file, let me know if it's preferable to add a commit that undoes that.

[chimurai]

Yes, please undo the changes to yarn.lock

I'll checkout the PR to do some additional testing.

[chimurai]

Thanks!

Published a new beta version

You can install it with:
npm install http-proxy-middleware@beta or npm install http-proxy-middleware@0.21.0-beta.3

Let me know if everything still works. I'll publish a final shortly after confirmation.

[rsethc]

Thanks, I'll try out this version and let you know if anything goes wrong.

[rsethc]

The "http-proxy-middleware@0.21.0-beta.3" seems to work as expected in what I'm working on.

[chimurai]

published final version: http-proxy-middleware@0.21.0