add CI badge to readme

README.md

@@ -1,10 +1,10 @@
+![build](https://github.com/Calsign/APDE/workflows/build/badge.svg)
+
 APDE (Android Processing Development Environment) is a [Processing](https://processing.org/) IDE 
 for creating and running sketches on Android devices. You can download APDE from 
 [Google Play](https://play.google.com/store/apps/details?id=com.calsignlabs.apde) or the 
 [releases page](https://github.com/Calsign/APDE/releases).
 
 Check out the [Wiki](https://github.com/Calsign/APDE/wiki) for documentation. If you just installed 
 APDE and you're looking to learn the basics, then head over to 
-[Getting Started](https://github.com/Calsign/APDE/wiki/Getting-Started).
-
-Looking for the [old README](https://github.com/Calsign/APDE/wiki/Old-README-(v0.3.3-and-older))?
+[Getting Started](https://github.com/Calsign/APDE/wiki/Getting-Started).