Store maven artifacts (#4)

Store maven artifacts of builds for easy access

Author: minoneer

.github/workflows/maven.yml

@@ -22,3 +22,8 @@ jobs:
         java-version: 1.8
     - name: Build with Maven
       run: mvn -B package
+    - name: Upload plugin artifact
+      uses: actions/upload-artifact@v2
+      with:
+        name: BookExploitFix
+        path: target/BookExploitFix.jar