chore(deps): Drop support for PHP 7.1 and PHPUnit 7

There is no version of PHPUnit that will run on PHP 7.1 and not conflict with roave/security-advisories.

Author: pauljura

.github/workflows/tests.yml

@@ -9,7 +9,7 @@ jobs:
         runs-on: ubuntu-latest
         strategy:
             matrix:
-                php-version: ['7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3']
+                php-version: ['7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3']
                 composer-prefer:
                     - '--prefer-dist'
                     - '--prefer-stable --prefer-lowest'

composer.json

@@ -3,15 +3,15 @@
     "description": "A utility library for working with Table Schema",
     "license": "MIT",
     "require": {
-        "php": ">=7.1.0",
+        "php": ">=7.2.0",
         "ext-mbstring": "*",
         "ext-json": "*",
         "justinrainbow/json-schema": "^5.2.10",
         "nesbot/carbon": "^2.63.0",
         "jmikola/geojson": "^1.0"
     },
     "require-dev": {
-        "phpunit/phpunit": ">=7.5 <10.0",
+        "phpunit/phpunit": ">=8.0 <10.0",
         "php-coveralls/php-coveralls": "^2.4",
         "psy/psysh": "@stable",
         "roave/security-advisories": "dev-latest"