README.md: Update badges and instructions.

Author: Gadgetoid

README.md

@@ -1,20 +1,25 @@
 # Pimoroni Trackball Breakout
 
-[![Build Status](https://travis-ci.com/pimoroni/trackball-python.svg?branch=master)](https://travis-ci.com/pimoroni/trackball-python)
-[![Coverage Status](https://coveralls.io/repos/github/pimoroni/trackball-python/badge.svg?branch=master)](https://coveralls.io/github/pimoroni/trackball-python?branch=master)
+[![Build Status](https://img.shields.io/github/actions/workflow/status/pimoroni/trackball-python/test.yml?branch=main)](https://github.com/pimoroni/trackball-python/actions/workflows/test.yml)
+[![Coverage Status](https://coveralls.io/repos/github/pimoroni/trackball-python/badge.svg?branch=main)](https://coveralls.io/github/pimoroni/trackball-python?branch=main)
 [![PyPi Package](https://img.shields.io/pypi/v/trackball.svg)](https://pypi.python.org/pypi/trackball)
 [![Python Versions](https://img.shields.io/pypi/pyversions/trackball.svg)](https://pypi.python.org/pypi/trackball)
 
-
 # Installing
 
 Stable library from PyPi:
 
-* Just run `sudo pip install trackball`
+If you're familiar with virtual environments and have one set up, just run `python3 -m pip install trackball`
+
+Otherwise:
+ 
+* `git clone https://github.com/pimoroni/trackball-python`
+* `cd trackball-python`
+* `./install.sh`
 
 Latest/development library from GitHub:
 
 * `git clone https://github.com/pimoroni/trackball-python`
 * `cd trackball-python`
-* `sudo ./install.sh`
+* `./install.sh --unstable`