Update ReADME.md to support version controlling

Author: rakibdevs

README.md

@@ -47,7 +47,11 @@ Add the following to your `providers` array in `config/app.php`:
 
 
 ```
-
+Add API key and desired language in `.env`
+```
+OPENWAETHER_API_KEY=
+OPENWAETHER_API_LANG=en
+```
 
 Publish the required package configuration file using the artisan command:
 ```
@@ -56,15 +60,22 @@ Publish the required package configuration file using the artisan command:
 Edit the `config/openweather.php` file and modify the `api_key` value with your Open Weather Map api key.
 ```php
 	return [
-	    'api_key' 	        => '',
-	    'lang' 		=> 'en',
+	    'api_key' 	        => env('OPENWAETHER_API_KEY', ''),
+    	    'onecall_api_version' => '2.5',
+            'historical_api_version' => '2.5',
+            'forecast_api_version' => '2.5',
+            'polution_api_version' => '2.5',
+            'geo_api_version' => '1.0',
+	    'lang' 		=> env('OPENWAETHER_API_LANG', 'en'),
 	    'date_format'       => 'm/d/Y',
 	    'time_format'       => 'h:i A',
 	    'day_format'        => 'l',
 	    'temp_format'       => 'c'         // c for celcius, f for farenheit, k for kelvin
 	];
 ```
 
+Now you can configure API version from config as [One Call API](https://openweathermap.org/price) is upgraded to version 3.0. Please set available api version in config. 
+
 
 ## Usage
 Here you can see some example of just how simple this package is to use.