Run CI on OTP 28 and 27

Author: ziopio

.github/workflows/ct.yml

@@ -15,14 +15,18 @@ jobs:
     name: Erlang/OTP ${{matrix.otp}} / rebar3 ${{matrix.rebar3}}
     strategy:
       matrix:
-        otp: ['27.1']
-        rebar3: ['3.24.0']
+        otp: ['28', '27']
+        rebar3: ['3.25.1']
     steps:
       - uses: erlef/setup-beam@v1
         with:
           otp-version: ${{matrix.otp}}
           rebar3-version: ${{matrix.rebar3}}
       - uses: actions/checkout@v2
+      - name: Prepare rebar3
+        run: |
+          rebar3 update
+          rebar3 plugins upgrade all
       - name: Compiling
         run: |
           eval `ssh-agent -s`