feat(typescript): types support

[chimurai]

fixes #345

[coveralls]

Coverage remained the same at ?% when pulling eb652c6 on typescript-types into 7a738ea on master.

[ghost]

DeepCode's analysis on #6b6823 found:

• ❌ 0 critical issues. ⚠️ 0 warnings and 0 minor issues. ✔️ 2 issues were fixed.

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[bennycode]

@chimurai can you publish a new release on npm? I would like to use the type definitions from "http-proxy-middleware" but on npm there is just JavaScript code (no definitions):

[chimurai]

@bennyn
[email protected] should have the type definitions included