Update readme, update billingo php sdk to minimum version number

Author: codespotdev

README.md

@@ -9,7 +9,7 @@ Compatible with: Laravel 6.x (LTS), Laravel 7.x and Laravel 8.x
 You can install the package via composer:
 
 ```bash
-composer require deviddev/billingo-api-v3-wrapper
+composer require deviddev/billingo-api-v3-wrapper:^v0.1
 ```
 
 ## Usage

composer.json

@@ -21,7 +21,7 @@
     "require": {
         "php": "^7.1",
         "illuminate/support": "^6|^7|^8",
-        "deviddev/billingo-api-v3-php-sdk": "dev-main"
+        "deviddev/billingo-api-v3-php-sdk": "^v0.1"
     },
     "require-dev": {
         "orchestra/testbench": "^4.0",