Merge pull request #54 from maxmind/greg/composer-validate

Run composer validate from lint workflow

.github/workflows/lint.yml

@@ -22,6 +22,9 @@ jobs:
  - name: Install dependencies
  run: composer install --no-progress --prefer-dist --optimize-autoloader
 
+ - name: Validate composer.json
+ run: composer validate
+
  - name: Lint with php-cs-fixer
  run: vendor/bin/php-cs-fixer fix --verbose --diff --dry-run