Solved-more-broken-links-in-README.md-(axmolengine#1677)

Fix license link that points to deleted branch (i.e. 404 page)

README.md

@@ -11,7 +11,7 @@ Please [visit our Wiki](https://github.com/axmolengine/axmol/wiki) to know more
 ***
 
 [![Latest Release](https://img.shields.io/github/v/release/axmolengine/axmol?include_prereleases&label=release)](https://github.com/axmolengine/axmol/releases)
-[![LICENSE](https://img.shields.io/badge/license-MIT-blue.svg)](https://github.com/axmolengine/axmol/blob/master/LICENSE)
+[![LICENSE](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
 [![Codacy Badge](https://app.codacy.com/project/badge/Grade/81fa1aba09ab41a98b949064b928d06e)](https://www.codacy.com/gh/axmolengine/axmol/dashboard?utm_source=github.com&utm_medium=referral&utm_content=axmolengine/axmol&utm_campaign=Badge_Grade)
 [![cxxstd](https://img.shields.io/badge/cxxstd-c++20-8A2BE2.svg)](https://github.com/axmolengine/axmol)