chore: update readme badge

Signed-off-by: Jack Cherng <jfcherng@gmail.com>

Author: jfcherng

.github/workflows/php.yml

@@ -48,9 +48,8 @@ jobs:
       - name: Install dependencies
         run: |
           composer global require hirak/prestissimo --prefer-dist --no-progress
-          composer config platform.php ${{ matrix.php-versions }}.999
-          composer install --prefer-dist --no-progress --no-suggest
-          composer update
+          composer config platform.php $(php -r 'preg_match("#^\d+\.\d+\.\d+#", PHP_VERSION, $v); echo $v[0];')
+          composer update --prefer-dist --no-progress --no-suggest
 
       - name: Run composer script "analyze"
         run: composer run-script analyze
@@ -92,9 +91,8 @@ jobs:
       - name: Install dependencies
         run: |
           composer global require hirak/prestissimo --prefer-dist --no-progress
-          composer config platform.php ${{ matrix.php-versions }}.999
-          composer install --prefer-dist --no-progress --no-suggest
-          composer update
+          composer config platform.php $(php -r 'preg_match("#^\d+\.\d+\.\d+#", PHP_VERSION, $v); echo $v[0];')
+          composer update --prefer-dist --no-progress --no-suggest
 
       - name: Run composer script "test"
         run: composer run-script test

README.md

@@ -36,7 +36,7 @@ which can be used to get the content of the `example/diff-table.css`.
 
 ## Requirements
 
-![php](https://img.shields.io/badge/php-%5E7.1.3-blue?style=flat-square)
+![php](https://img.shields.io/badge/php-%E2%89%A57.1.3-blue?style=flat-square)
 ![ext-iconv](https://img.shields.io/badge/ext-iconv-brightgreen?style=flat-square)