Maybe fix artifact upload?

.github/workflows/build.yaml

@@ -19,10 +19,10 @@ jobs:
           key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
           restore-keys: |
             ${{ runner.os }}-gradle-
-      - name: Test on Java 8
+      - name: Build
         run: ./gradlew build
       - name: Upload artifacts
-        uses: actions/upload-artifact@v1
+        uses: actions/upload-artifact@v2
         with:
           name: build-artifacts
           path: |