Update README.md to fix setup-python version in example (actions#368)

Update README.md to fix setup-python version in example (actions#368)

Remove legacy PyPy input (actions#342)

Add fix for Windows caching of pip (actions#332)

Add fix for Windows caching of pip (actions#332)

Update @actions/cache version to 1.0.8 (actions#283)

Add a workflow to release a new version of the action (actions#274)

Fix PyPy installation on Windows to adopt new parameters format (acti…

…ons#201)

* test for pypy new version notation

* formatting

* uncommented condition

* test

* added pypy to test matrix

* test

* test

* restored all tests

* removed logs, added multiarch support for toolcache

* reduced test matrix

* removed extra condition about arch

fix is_windows (actions#172)

added Scripts to PATH on Windows (actions#173)

Co-authored-by: Nikita Bykov <v-nibyko@microsoft.com>