Add PHP7.1 for tests

* Added PHP7.1 for unit tests as well
5 jobs for php7.1 in 1 minute and 23 seconds (queued for 1 second)
Status Job ID Name Coverage
  Lint
passed #2986
lint:lint-php5.4

00:00:51

passed #2987
lint:lint-php5.6

00:00:49

passed #2988
lint:lint-php7.0

00:00:49

passed #2989
lint:lint-php7.1

00:00:50

 
  Codesniffer
passed #2990
allowed to fail
codesniffer

00:00:32