Created travis config file to enable memcached extension

.travis-php.ini

@@ -0,0 +1 @@
+extension="memcached.so"

.travis.yml

@@ -10,6 +10,8 @@ php:
   - 7
   - 7.1
 
+before_install: phpenv config-add .travis-php.ini
+
 before_script:
   - composer self-update
   - composer install --no-interaction
@@ -23,8 +25,3 @@ after_script:
   - php ocular.phar code-coverage:upload --format=php-clover build/clover.xml
 
 sudo: false
-
-matrix:
-  fast_finish: true
-  allow_failures:
-    - php: 7.1