Fixing internal license anchor

Author: DrkSephy

README.md

@@ -20,7 +20,7 @@ snippet examples for your day to day workflow. Contributions are welcome!
 - [Generators](#generators)
 - [Async Await](#async-await)
 - [Getter/Setter functions](#getter-and-setter-functions)
-- [License](#License)
+- [License](#license)
 
 ## var versus let / const
 

README_ko.md

@@ -20,7 +20,7 @@ ES2015(ES6)의 Tip & Tricks, 좋은 활용사례들과 코드 예제들이 포
 - [제너레이터(Generator)](#제너레이터generator)
 - [Async Await](#async-await)
 - [Getter/Setter 함수](#getter와-setter-함수)
-- [License](#License)
+- [License](#license)
 
 ## var VS let / const
 

README_zhCn.md

@@ -19,7 +19,7 @@
 - [Promises](#promises)
 - [Generators](#generators)
 - [Async Await](#async-await)
-- [License](#License)
+- [License](#license)
 
 ## var versus let / const