Add origin and reflectOrigin options

v1.2.0

docs: add Travis CI badge

Fix of merging of custom headers with proxying request headers

v1.1.1

fix: [fix/custom-headers]: merging of custom headers with proxying re…

Ability to add custom headers for every proxied request

Ability to add custom headers for every proxied request (#1)

* feat: [feature/custom-headers]: initial commit

* feat: [feature/custom-headers]: ability to add custom headers for every proxied request