Add codecov for github actions.

Author: javadev

.github/workflows/maven.yml

@@ -8,10 +8,15 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
     - name: Set up JDK 1.8
       uses: actions/setup-java@v1
       with:
         java-version: 1.8
     - name: Build with Maven
-      run: mvn test --file pom.xml -B 
+      run: mvn test jacoco:report --file pom.xml -B 
+
+    - uses: codecov/codecov-action@v1
+      with:
+        file: ./**/target/site/jacoco/jacoco.xml
+        name: codecov