Gitlab-CI: Hopefully fix shown coverage

Signed-off-by: Taylor Smock <tsmock@fb.com>

.gitlab-ci.yml

@@ -127,6 +127,7 @@ coverage:
   image: haynes/jacoco2cobertura:1.0.3
   script:
     - 'python /opt/cover2cover.py build/reports/jacoco/test/jacocoTestReport.xml src/main/java > build/reports/jacoco/test/coverage.xml'
+    - 'python /opt/source2filename.py build/reports/jacoco/test/coverage.xml'
   artifacts:
     reports:
       cobertura: "build/reports/jacoco/test/coverage.xml"