refactoring to avoid flag definition clash (#336)

* moving flag.Parse() from init to main function(s) fixes #309

* updating go to version 1.18, moving init code into main function

* updating go to version 1.18, moving init code into main function

moving flag.Parse() from init to main function(s) fixes #309 (#334)

Adds HTTP/2 and gRPC support to Martian Proxy (#318)

* HTTP/2 and gRPC support for Martian.

Changes are opt-in via h2.Config being set in mitm.Config so have no
impact on existing uses.

Closes issue #268

adding a noop/noop modifier with a json API (#319)

* Adding a noop modifier in its own noop package

Adds HTTP/2 and gRPC support to Martian Proxy (#318)

* HTTP/2 and gRPC support for Martian.

Changes are opt-in via h2.Config being set in mitm.Config so have no
impact on existing uses.

Closes issue #268

Using strings.EualFold() for efficient string comparison (#305)

Add modules support and bump version up to 3.0.0. (#292)

* Add modules support and bump version up to 3.0.0.

deflaking (#265)

* remove logspam

* more logspam

* more logspam

Merge pull request #25 from google/proxy-binary

examples/main: move to cmd/proxy and support as de facto proxy binary.

Merge pull request #19 from google/readme-updates

Readme updates