Do not disable xdebug on Travis, needed for code coverage

Author: schmengler

.travis/before_script.sh

@@ -9,8 +9,7 @@ echo # print a newline
 smtp-sink -d "%d.%H.%M.%S" localhost:2500 1000 &
 echo 'sendmail_path = "/usr/sbin/sendmail -t -i "' > ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/sendmail.ini
 
-# disable xdebug and adjust memory limit
-echo > ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/xdebug.ini
+# adjust memory limit
 echo 'memory_limit = -1' >> ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/travis.ini
 phpenv rehash;