Add php7.1, remove hhvm (#13)

HHVM build errors about ``` The command "sudo apt-get install -y hhvm" failed and exited with 100 during . ``` https://travis-ci.org/hostnet/symfony1/jobs/231082063
hostnet · May 12, 2017 · 1b22e7c · 1b22e7c
1 parent 644156c
commit 1b22e7c
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/.travis.yml b/.travis.yml
@@ -1,8 +1,8 @@
 language: php
 php:
+ - 7.1
  - 7.0
  - 5.6
- - hhvm
 
 before_script:
  - composer install --dev