update LICENSE

Z-Zheng · Z-Zheng · commit da203a53382d · 2020-05-28T18:43:13.000+08:00
diff --git a/README.md b/README.md
@@ -1,4 +1,4 @@
-[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
+[![License: GPL v3](https://img.shields.io/badge/License-GPL%20v3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)
 [![Travis-CI](https://travis-ci.org/LiyuanLucasLiu/RAdam.svg?branch=master)](https://travis-ci.org/LiyuanLucasLiu/RAdam)
 
 

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)`
	`1`	`+[![License: GPL v3](https://img.shields.io/badge/License-GPL%20v3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)`
`2`	`2`	`[![Travis-CI](https://travis-ci.org/LiyuanLucasLiu/RAdam.svg?branch=master)](https://travis-ci.org/LiyuanLucasLiu/RAdam)`
`3`	`3`
`4`	`4`