Remove travis

It's gonna be a lot of work to build, so we're just gonna use GitHub actions

Author: dmulloy2

.travis.yml

@@ -1,4 +1,4 @@
-# ProtocolLib [![Travis Status](https://travis-ci.com/dmulloy2/ProtocolLib.svg?branch=master)](https://travis-ci.com/dmulloy2/ProtocolLib)
+# ProtocolLib
 
 Certain tasks are impossible to perform with the standard Bukkit API, and may require
 working with and even modify Minecraft directly. A common technique is to modify incoming