update readme

Author: j2doll

README.md

@@ -11,5 +11,5 @@
 - Windows 10 x64 (Maybe it will also build on Windows 7/8 x64.)
 
 ## License
-- json-downloader is under GPL License 3. [https://github.com/j2doll/json-downloader](https://github.com/j2doll/json-downloader)
+- json-downloader is under GPL 3 license. [https://github.com/j2doll/json-downloader](https://github.com/j2doll/json-downloader)
 - curl is under MIT style license. [https://curl.haxx.se/docs/copyright.html](https://curl.haxx.se/docs/copyright.html)