Fix link for linear-gradient documentation

Corrected the link for linear-gradient in README.

Author: nikolay-kapustin

README.md

@@ -5,7 +5,7 @@
 [![License](https://img.shields.io/cocoapods/l/BadgeSwift.svg?style=flat)](/LICENSE)
 [![Platform](https://img.shields.io/cocoapods/p/BadgeSwift.svg?style=flat)](http://cocoadocs.org/docsets/BadgeSwift)
 
-The main idea of this converter is adopt the same gradient from Web to iOS. The CSS has [linear-gradient()](https://developer.mozilla.org/ru/docs/Web/CSS/linear-gradient)
+The main idea of this converter is adopt the same gradient from Web to iOS. The CSS has [linear-gradient()](https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/gradient/linear-gradient)
  func to create gradient.
  ## Web CSS
  ```javascript