Set jackson-databind version for coverage test

Author: oschwald

.travis.yml

@@ -20,7 +20,7 @@ env:
     - secure: KXF3RVBZDxeASAnleYlTaqvxRRB9FSzSAdVV9h7Kw81+p4UO64b8CPJR1p4fLIVwAp8C4R8h0xZDN3pAv/iyeA4ndIeh9tQXNZBm737RE5x+6x6nf/shP/Em1w9T1s3KmretXoTFK5NJGv2yTesgaIAV/JV1OFvlG6ArswhrPFc=
 install: mvn install -DskipTests=true -Dgpg.skip=true -Djackson-databind.version=2.7.3
 script: mvn test -Djackson-databind.version=2.7.3
-after_script: mvn cobertura:cobertura coveralls:cobertura
+after_script: mvn cobertura:cobertura coveralls:cobertura -Djackson-databind.version=2.7.3
 notifications:
   email:
     on_failure: always