Fix shields in readme.

Author: jyapayne

README.md

@@ -1,6 +1,6 @@
-[![Github Releases (by Release)](https://img.shields.io/github/downloads/jyapayne/Web2Executable/v0.5.0b/total.svg?maxAge=2592000)]()
+[![Github Releases (by Release)](https://img.shields.io/github/downloads/jyapayne/Web2Executable/v0.5.0b/total.svg)]()
 
-[![Github All Releases](https://img.shields.io/github/downloads/jyapayne/Web2Executable/total.svg?maxAge=2592000)]()
+[![Github All Releases](https://img.shields.io/github/downloads/jyapayne/Web2Executable/total.svg)]()
 
 Web2Executable
 ==============