Fix INSTALL.md path in the README.md

INSTALL.md file's actual path is ./INSTALL.md

Author: mehrdad-khojastefar

README.md

@@ -6,7 +6,7 @@
 
 ## Install
 
-All instructions can be found [in the docs](/docs/INSTALL.md).
+All instructions can be found [in the docs](./INSTALL.md).
 
 ## Configuration