[3.x] Update README/SECURITY (#49)

* Update README.md

* Update SECURITY.md

Author: heelc29

README.md

@@ -1,4 +1,4 @@
-# The String Package [![Build Status](https://ci.joomla.org/api/badges/joomla-framework/string/status.svg?ref=refs/heads/2.0-dev)](https://ci.joomla.org/joomla-framework/string)
+# The String Package [![Build Status](https://ci.joomla.org/api/badges/joomla-framework/string/status.svg?ref=refs/heads/3.x-dev)](https://ci.joomla.org/joomla-framework/string)
 
 [![Latest Stable Version](https://poser.pugx.org/joomla/string/v/stable)](https://packagist.org/packages/joomla/string)
 [![Total Downloads](https://poser.pugx.org/joomla/string/downloads)](https://packagist.org/packages/joomla/string)
@@ -7,18 +7,18 @@
 
 ## Installation via Composer
 
-Add `"joomla/string": "~2.0"` to the require block in your composer.json and then run `composer install`.
+Add `"joomla/string": "~3.0"` to the require block in your composer.json and then run `composer install`.
 
 ```json
 {
 	"require": {
-		"joomla/string": "~2.0"
+		"joomla/string": "~3.0"
 	}
 }
 ```
 
 Alternatively, you can simply run the following from the command line:
 
 ```sh
-composer require joomla/string "~2.0"
+composer require joomla/string "~3.0"
 ```

SECURITY.md

@@ -6,8 +6,9 @@ These versions are currently being supported with security updates:
 
 | Version | Supported          |
 | ------- | ------------------ |
+| 3.x.x   | :white_check_mark: |
 | 2.0.x   | :white_check_mark: |
-| 1.4.x   | :white_check_mark: |
+| 1.4.x   | :x:                |
 | < 1.4   | :x:                |
 
 ## Reporting a Vulnerability