Update workflow

.github/workflows/gradle.yml

@@ -1,24 +1,21 @@
 name: Java CI
 
-on: 
-  push:
-    branches:
-    - master
+on: [push, pull_request]
 
 jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
       with: 
         submodules: recursive
     - name: Set up JDK 1.8
       uses: actions/setup-java@v1
       with:
-        java-version: 1.8
+        java-version: 8
     - name: Build with Gradle
       run: ./gradlew clean test build
     - uses: actions/upload-artifact@v2
       with:
-        name: artifact
+        name: artifacts
         path: build/release/*