Drop support for PHP 7.1 and PHP 7.2

Author: sebastianbergmann

.travis.yml

@@ -3,8 +3,6 @@ language: php
 dist: bionic
 
 php:
-  - 7.1
-  - 7.2
   - 7.3
   - 7.4
 

ChangeLog.md

@@ -2,6 +2,12 @@
 
 All notable changes are documented in this file using the [Keep a CHANGELOG](http://keepachangelog.com/) principles.
 
+## [4.0.0] - 2020-02-07
+
+### Removed
+
+* Removed support for PHP 7.1 and PHP 7.2
+
 ## [3.0.2] - 2019-02-04
 
 ### Changed
@@ -46,6 +52,7 @@ All notable changes are documented in this file using the [Keep a CHANGELOG](htt
 
 * This component is no longer supported on PHP 5.6
 
+[4.0.0]: https://github.com/sebastianbergmann/diff/compare/3.0.2...master
 [3.0.2]: https://github.com/sebastianbergmann/diff/compare/3.0.1...3.0.2
 [3.0.1]: https://github.com/sebastianbergmann/diff/compare/3.0.0...3.0.1
 [3.0.0]: https://github.com/sebastianbergmann/diff/compare/2.0...3.0.0

composer.json

@@ -15,15 +15,19 @@
         }
     ],
     "prefer-stable": true,
+    "minimum-stability": "dev",
     "config": {
+        "platform": {
+            "php": "7.3.0"
+        },
         "optimize-autoloader": true,
         "sort-packages": true
     },
     "require": {
-        "php": "^7.1"
+        "php": "^7.3"
     },
     "require-dev": {
-        "phpunit/phpunit": "^7.5 || ^8.0",
+        "phpunit/phpunit": "^9.0",
         "symfony/process": "^4 || ^5"
     },
     "autoload": {
@@ -38,7 +42,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "3.0-dev"
+            "dev-master": "4.0-dev"
         }
     }
 }