Update PHP SDK dependency to latest version

Author: jeromegamez

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## Unreleased
 
+* Updated `kreait/firebase-php` to `^4.40.0`
 * A relative path to a credentials file is now resolved with `base_path()` to address issues on Windows systems [#7](https://github.com/kreait/laravel-firebase/issues/7) 
 
 ## 1.3.0 - 2020-01-15

README.md

@@ -3,9 +3,6 @@
 A Laravel package for the [Firebase PHP Admin SDK](https://github.com/kreait/firebase-php).
 
 [![Current version](https://img.shields.io/packagist/v/kreait/laravel-firebase.svg?logo=composer)](https://packagist.org/packages/kreait/laravel-firebase)
-[![Firebase Admin SDK version](https://img.shields.io/badge/Firebase%20Admin%20SDK-%5E4.35.0-blue)](https://packagist.org/packages/kreait/firebase-php)
-![Supported Laravel versions](https://img.shields.io/badge/Laravel-%3E%3D5.8-blue)
-![Supported Lumen versions](https://img.shields.io/badge/Lumen-%3E%3D5.8-blue)
 [![Discord](https://img.shields.io/discord/523866370778333184.svg?color=7289da&logo=discord)](https://discord.gg/nbgVfty)
 
 * [Installation](#installation)

composer.json

@@ -11,7 +11,7 @@
         }
     ],
     "require": {
-        "kreait/firebase-php": "^4.38.1",
+        "kreait/firebase-php": "^4.40.0",
         "illuminate/contracts": "^5.8|^6.0",
         "illuminate/support": "^5.8|^6.0"
     },