Make travis use newer php

Author: jimmypuckett

.travis.yml

@@ -13,9 +13,13 @@ env:
 
 matrix:
   include:
-    - php: 5.6
+    - php: 7.0
       env: setup=lowest
-    - php: 5.6
+    - php: 7.0
+      env: setup=stable
+    - php: 7.1
+      env: setup=lowest
+    - php: 7.1
       env: setup=stable
 
 sudo: false
@@ -25,7 +29,7 @@ cache:
     - $HOME/.composer/cache
 
 before_install:
-  - if [[ $TRAVIS_PHP_VERSION != 7.1 ]] ; then phpenv config-rm xdebug.ini; fi
+  - echo "extension = memcached.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini
   - travis_retry composer self-update
 
 install: