Update description (#7)

Author: tangrufus

README.md

@@ -12,7 +12,7 @@
 [![Hire Typist Tech](https://img.shields.io/badge/Hire-Typist%20Tech-778899)](https://typist.tech/contact/)
 
 <p>
-  <strong>Generate PHP version matrix according to `composer.json`.</strong>
+  <strong>Generate PHP version matrix according to <code>composer.json</code></strong>
   <br>
   <br>
   Built with ♥ by <a href="https://typist.tech/">Typist Tech</a>

action.yml

@@ -1,5 +1,5 @@
 name: PHP Matrix
-description: TODO
+description: Generate PHP version matrix according to `composer.json`
 
 author: Typist Tech Limited
 branding:

composer.json

@@ -1,6 +1,6 @@
 {
     "name": "typisttech/php-matrix-action-action",
-    "description": "TODO",
+    "description": "Generate PHP version matrix according to `composer.json`",
     "type": "project",
     "keywords": [
       "ci",