remove duplicate sed command

travis-build.sh

@@ -39,8 +39,6 @@ if [ -n "${PHP_VERSION}" ]; then
         sed -i -- 's/PHP_FPM_INSTALL_XDEBUG=true/PHP_FPM_INSTALL_XDEBUG=false/g' .env
     fi
 
-    sed -i -- 's/CHANGE_SOURCE=true/CHANGE_SOURCE=false/g' .env
-
     cat .env
     docker-compose build ${BUILD_SERVICE}
     docker images