Updated dependencies (php>=7.3)

Author: prwater

.travis.yml

@@ -1,8 +1,7 @@
 language: php
 php:
-  - '7.1'
-  - '7.2'
   - '7.3'
+  - '7.4'
 
 install:
   - rm -f composer.lock

composer.json

@@ -11,15 +11,15 @@
   ],
   "license": "MIT",
   "require": {
-    "php": ">=7.1.0",
+    "php": ">=7.3",
     "hassankhan/config": "^2.0",
     "setbased/error-handler": "^1.1",
     "setbased/helper-cast": "^2.0",
     "setbased/php-stratum-backend": "^5.0",
-    "symfony/console": "^4.0 || ^5.0"
+    "symfony/console": "^5.0"
   },
   "require-dev": {
-    "phpunit/phpunit": "^7.0 || ^8.0",
+    "phpunit/phpunit": "^9.0",
     "setbased/phing-extensions": "^2.0.1"
   },
   "autoload": {
@@ -36,6 +36,7 @@
     "bin/stratum"
   ],
   "config": {
-    "bin-dir": "bin/"
+    "bin-dir": "bin/",
+    "sort-packages": true
   }
 }