Add PHP 7.1 to Travis & fix php-cs-fixer

I don't want to update the .php_cs to be compatible with php-cs-fixer 2.
It works great like that atm.

.travis.yml

@@ -7,6 +7,8 @@ php:
     - 5.5
     - 5.6
     - 7.0
+    - 7.1
+    - nightly
     - hhvm
 
 matrix:
@@ -16,6 +18,7 @@ matrix:
     fast_finish: true
     allow_failures:
         - php: hhvm
+        - php: nightly
 
 # faster builds on new travis setup not using sudo
 sudo: false
@@ -32,6 +35,8 @@ before_install:
     # see: https://blog.travis-ci.com/upcoming_ubuntu_11_10_migration/
     - if [[ $TRAVIS_PHP_VERSION = 5.3.3 ]]; then composer config -g -- disable-tls true; fi;
     - if [[ $TRAVIS_PHP_VERSION = 5.3.3 ]]; then composer config -g -- secure-http false; fi;
+    # no version compatible with PHP > 7.1
+    - if [[ $TRAVIS_PHP_VERSION = 7.2.* ]]; then composer remove friendsofphp/php-cs-fixer; fi;
 
 install:
     - composer self-update

composer.json

@@ -25,11 +25,11 @@
     }],
     "require": {
         "php": ">=5.3.3",
-        "monolog/monolog": "^1.13.1"
+        "monolog/monolog": "^1.13"
     },
     "require-dev": {
         "satooshi/php-coveralls": "~0.6",
-        "friendsofphp/php-cs-fixer": "*"
+        "friendsofphp/php-cs-fixer": "<2"
     },
     "autoload": {
         "psr-4": { "Readability\\": "src/" }