setup-java v2 (#376)

https://github.com/actions/setup-java/blob/main/README.md
[skip ci]

Author: sullis

.github/workflows/ci.yml

@@ -38,8 +38,9 @@ jobs:
           fetch-depth: '0' # https://github.com/shipkit/shipkit-changelog#fetch-depth-on-ci
 
       - name: 2. Set up Java ${{ matrix.java }}
-        uses: actions/setup-java@v1
+        uses: actions/setup-java@v2
         with:
+          distribution: 'zulu'
           java-version: ${{ matrix.java }}
 
       - name: 3. Build on Java ${{ matrix.java }}
@@ -65,8 +66,9 @@ jobs:
           fetch-depth: '0' # https://github.com/shipkit/shipkit-changelog#fetch-depth-on-ci
 
       - name: Set up Java 8
-        uses: actions/setup-java@v1
+        uses: actions/setup-java@v2
         with:
+          distribution: 'zulu'
           java-version: 8
 
       - name: Build and publish to Bintray/MavenCentral