update php version to 7.4

Author: mmasiukevich

.travis.yml

@@ -1,13 +1,8 @@
 language: php
 
 php:
-  - 7.3
   - 7.4snapshot
 
-matrix:
-  allow_failures:
-    - php: 7.4snapshot
-
 cache:
   directories:
     - $HOME/.cache/composer
@@ -24,10 +19,10 @@ install:
 
 script:
   - ./vendor/bin/phpunit --configuration ./phpunit.xml --coverage-clover=coverage.clover
-  - if [ "$TRAVIS_PHP_VERSION" == "7.3" ]; then ./vendor/bin/psalm --config=psalm.xml; fi
-  - if [ "$TRAVIS_PHP_VERSION" == "7.3" ]; then ./vendor/bin/phpstan analyse src --level 7; fi
-  - if [ "$TRAVIS_PHP_VERSION" == "7.3" ]; then ./vendor/bin/php-cs-fixer fix --allow-risky=yes --dry-run; fi
+  - ./vendor/bin/psalm --config=psalm.xml
+  - ./vendor/bin/phpstan analyse src --level 7
+  - ./vendor/bin/php-cs-fixer fix --allow-risky=yes --dry-run
 
 after_script:
-  - if [ "$TRAVIS_PHP_VERSION" == "7.3" ]; then wget -c -nc --retry-connrefused --tries=0 https://scrutinizer-ci.com/ocular.phar; fi
-  - if [ "$TRAVIS_PHP_VERSION" == "7.3" ]; then php ocular.phar code-coverage:upload --format=php-clover coverage.clover; fi
+  - wget -c -nc --retry-connrefused --tries=0 https://scrutinizer-ci.com/ocular.phar
+  - php ocular.phar code-coverage:upload --format=php-clover coverage.clover

README.md

@@ -1,7 +1,7 @@
 ## What is it?
-[![Build Status](https://travis-ci.org/php-service-bus/mutex.svg?branch=v3.3)](https://travis-ci.org/php-service-bus/mutex)
-[![Code Coverage](https://scrutinizer-ci.com/g/php-service-bus/mutex/badges/coverage.png?b=v3.3)](https://scrutinizer-ci.com/g/php-service-bus/mutex/?branch=v3.3)
-[![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/php-service-bus/mutex/badges/quality-score.png?b=v3.3)](https://scrutinizer-ci.com/g/php-service-bus/mutex/?branch=v3.3)
+[![Build Status](https://travis-ci.org/php-service-bus/mutex.svg?branch=v4.0)](https://travis-ci.org/php-service-bus/mutex)
+[![Code Coverage](https://scrutinizer-ci.com/g/php-service-bus/mutex/badges/coverage.png?b=v4.0)](https://scrutinizer-ci.com/g/php-service-bus/mutex/?branch=v4.0)
+[![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/php-service-bus/mutex/badges/quality-score.png?b=v4.0)](https://scrutinizer-ci.com/g/php-service-bus/mutex/?branch=v4.0)
 
 This component is part of the [PHP Service Bus](https://github.com/php-service-bus/service-bus): mutexes implementation.
 > The code is partly based on the [amp/sync](https://github.com/amphp/sync) project.

composer.json

@@ -27,14 +27,14 @@
     }
   },
   "require": {
-    "php": ">=7.3",
-    "amphp/amp": "v2.2.*",
-    "amphp/file": "v0.3.*"
+    "php": ">=7.4",
+    "amphp/amp": "v2.4.*",
+    "amphp/file": "v1.0.*"
   },
   "require-dev": {
-    "php-service-bus/code-style-config": "v0.1.*",
-    "phpunit/phpunit": "v8.3.*",
-    "vimeo/psalm": "v3.4.*",
+    "php-service-bus/code-style-config": "v1.1.*",
+    "phpunit/phpunit": "v8.4.*",
+    "vimeo/psalm": "v3.7.*",
     "phpstan/phpstan": "v0.11.*"
   },
   "prefer-stable": true,