attempting to fix travis tests

Author: proycon

.travis.yml

@@ -25,6 +25,7 @@ notifications:
 
 install:
     - echo -e "[hostsecurity]\ndisabletls10warning = true" > ~/.hgrc
+    - if [[ $TRAVIS_OS_NAME == "linux" ]]; then sudo apt remove mysql-server mysql-server-5.7 postgresql-10 postgresql-9.4 postgresql-9.5 postgresql-9.6; fi
     - if [[ $TRAVIS_OS_NAME == "linux" ]]; then sudo rm -rf /opt/pyenv; fi
     - sudo update-java-alternatives -s java-1.8.0-openjdk-amd64
     - mkdir /home/travis/build/LaMachine