Get ready for 0.9.7.3 release

readme.md

@@ -51,7 +51,7 @@ glm::mat4 camera(float Translate, glm::vec2 const & Rotate)
 
 ## Release notes
 
-#### [GLM 0.9.7.3](https://github.com/g-truc/glm/tree/0.9.7) - 2016-XX-XX
+#### [GLM 0.9.7.3](https://github.com/g-truc/glm/releases/tag/0.9.7.3) - 2016-02-21
 ##### Improvements:
 - Added AVX512 detection