Update maven.yml

Hopefully this will fix it?

.github/workflows/maven.yml

@@ -1,16 +1,15 @@
 name: Maven Test
 
-on: [push]
+on: [push, pull_request]
 
 jobs:
   build:
-
-    runs-on: ubuntu-latest
+    runs-on: [ubuntu-latest, windows-latest]
 
     steps:
     - uses: actions/checkout@v2
     - name: Set up JDK 11
-      uses: actions/setup-java@v1
+      uses: actions/setup-java@v1.3.0
       with:
         java-version: 11
     - name: Build with Maven