Try CI 2

.github/workflows/ci.yml

@@ -5,12 +5,12 @@ jobs:
     name: mix test (Elixir ${{ matrix.elixir }} OTP ${{ matrix.otp }})
     strategy:
       matrix:
-        elixir: ["1.7.4-otp-20", "1.17.3-otp-27"]
+        elixir: ["1.7.4", "1.17.3"]
         include:
-          - elixir: "1.7.4-otp-20"
-            otp: "20"
-          - elixir: "1.17.3-otp-27"
-            otp: "27"
+          - elixir: "1.7.4"
+            otp: "20.x"
+          - elixir: "1.17.3"
+            otp: "27.x"
     runs-on: ubuntu-latest
     services:
       db:
@@ -44,8 +44,8 @@ jobs:
       - uses: actions/checkout@v2
       - uses: erlef/setup-beam@v1
         with:
-          otp-version: "27"
-          elixir-version: "1.17.3-otp-27"
+          otp-version: "27.x"
+          elixir-version: "1.17.3"
       - name: Install Dependencies
         run: mix deps.get
       - name: Run Formatter