Switch to github workflow & use develop branch for mainline OTP24 work.

Author: Martin Cox

.github/workflows/erlang.yml

@@ -0,0 +1,26 @@
+name: Erlang CI
+
+on:
+  push:
+    branches: [ develop ]
+  pull_request:
+    branches: [ develop ]
+
+
+jobs:
+
+  build:
+
+    runs-on: ubuntu-latest
+
+    container:
+      image: erlang:24.2.0.0
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Compile
+        run: ./rebar3 compile
+      - name: Run xref and dialyzer
+        run: ./rebar3 do xref, dialyzer
+      - name: Run eunit
+        run: ./rebar3 eunit

.travis.yml

@@ -1,5 +1,8 @@
 # riak dt
 
+[![Actions Status](https://github.com/basho/riak_dt/workflows/Erlang%20CI/badge.svg)](https://github.com/basho/riak_dt/actions)
+
+
 ## WHAT?
 
 A set of state based CRDTs implemented in Erlang and  on the paper -