Improve travis (#2)

* Improve travis

* Fix future php-cs-fixer config changes

* Skip php-cs-fixer env checks

.php_cs.dist

@@ -15,7 +15,7 @@ return PhpCsFixer\Config::create()
         'array_indentation' => true,
         'array_syntax' => ['syntax' => 'short'],
         'backtick_to_shell_exec' => true,
-        'blank_line_before_return' => true,
+        'blank_line_before_statement' => true,
         'class_keyword_remove' => false,
         'combine_consecutive_issets' => true,
         'combine_consecutive_unsets' => true,

.travis.yml

@@ -1,13 +1,12 @@
 language: php
 
-php:
-  - 7.2
-  - nightly
-
 env:
-  matrix:
-    -
-    - DEPENDENCIES=--prefer-lowest
+    global:
+        - DEFAULT_COMPOSER_FLAGS="--optimize-autoloader --no-interaction --no-progress"
+        - COMPOSER_FLAGS=""
+
+before_install:
+    - alias composer=composer\ --no-interaction && composer selfupdate
 
 cache:
   directories:
@@ -18,11 +17,28 @@ matrix:
   allow_failures:
     - php: nightly
 
-before_install:
-  - alias composer=composer\ --no-interaction && composer selfupdate
-
-install:
-  - travis_retry composer update --no-progress --profile --no-scripts --no-suggest $DEPENDENCIES
+jobs:
+    include:
+        - &STANDARD_TEST_JOB
+            stage: Test
+            php: 7.2
+            install:
+                - travis_retry composer update $DEFAULT_COMPOSER_FLAGS $COMPOSER_FLAGS
+                - composer info -D | sort
+            script:
+                - vendor/bin/grumphp run
+        -
+            <<: *STANDARD_TEST_JOB
+            stage: Test
+            php: 7.2
+            env: COMPOSER_FLAGS="--prefer-stable --prefer-lowest"
+        -
+            <<: *STANDARD_TEST_JOB
+            stage: Test
+            php: nightly
+            env: COMPOSER_FLAGS="--ignore-platform-reqs" PHP_CS_FIXER_IGNORE_ENV=1 PHP_CS_FIXER_FUTURE_MODE=1
+            script:
+                - vendor/bin/grumphp run
 
-script:
-   - vendor/bin/grumphp run
+    allow_failures:
+        - php: nightly

README.md

@@ -17,7 +17,7 @@ Since handling the exceptions is up to the framework, here is a list of known fr
 ## Installation
 
 ```sh
-composer require --dev phpro/api-problem
+composer require phpro/api-problem
 ```
 
 ## Usage