Add back the CI badge to our README
To advertise that we are a fancy project that takes our test suite seriously :)
# Pallene
+[![Actions Status](https://github.com/pallene-lang/pallene/workflows/Github%20Actions%20CI/badge.svg)](https://github.com/pallene-lang/pallene/actions)
Pallene is a statically typed, ahead-of-time-compiled sister language to
[Lua](https://www.lua.org), with a focus on performance. It is also a
