Add fixed JDK version and OpenJDK distro to support it (#96)

* Include latest JDK LTS and fixed versions

* Remove 17, Gradle conflicts

* Move from adopt to temurin

* Move from temurin to zulu

.github/workflows/ci.yml

@@ -6,13 +6,17 @@ jobs:
   build:
     name: Build
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        os: [ubuntu-18.04, macOS-latest, windows-2016]
+        java: [11, 11.0.3] 
     steps:
       - uses: actions/checkout@v1
       - name: set up JDK 11
         uses: actions/setup-java@v2
         with:
-          distribution: 'adopt'
-          java-version: 11
+          distribution: 'zulu'
+          java-version: ${{ matrix.java }}
       - name: Make gradlew executable
         run: chmod +x ./gradlew
       - name: Build