Merge release 1.3.1 into master

.travis.yml

@@ -8,18 +8,25 @@ php:
   - 7.3
   - 7.4
 
+env:
+  global:
+    - COMPOSER_ROOT_VERSION=1.4
+
 before_install:
   - mv ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/xdebug.ini{,.disabled} || echo "xdebug not available"
-  - travis_retry composer self-update
 
 install:
   - rm composer.lock
   - travis_retry composer update --prefer-dist
+  - composer validate --strict
 
 script:
   - ./vendor/bin/phpunit -v
 
 jobs:
+  allow_failures:
+    - php: nightly
+
   include:
     - stage: Test
       env: COVERAGE
@@ -33,6 +40,12 @@ jobs:
         - travis_retry wget https://scrutinizer-ci.com/ocular.phar
         - travis_retry php ocular.phar code-coverage:upload --format=php-clover build/logs/clover.xml
 
+    - stage: Test
+      php: nightly
+      before_install:
+        - mv ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/xdebug.ini{,.disabled} || echo "xdebug not available"
+        - composer config platform.php 7.4.99
+
     - stage: Code Quality
       env: CODING_STANDARDS
       php: 7.1

composer.json

@@ -15,8 +15,13 @@
             "homepage": "http://ocramius.github.com/"
         }
     ],
+    "config": {
+        "platform": {
+            "php": "7.1.27"
+        }
+    },
     "require": {
-        "php": "^7.1"
+        "php": "^7.1 || ^8.0"
     },
     "require-dev": {
         "ext-phar":                  "*",