README.md upgrade

Summary: Closes https://github.com/facebook/infer/pull/488

Differential Revision: D4284087

Pulled By: jvillard

fbshipit-source-id: f52fe23

README.md

@@ -9,7 +9,7 @@ Objective-C and C, written in [OCaml](https://ocaml.org/).
 Read our [Getting
 Started](http://fbinfer.com/docs/getting-started.html) page for
 details on how to install packaged versions of Infer. To build Infer
-from source, see INSTALL.md.
+from source, see [INSTALL.md](./INSTALL.md).
 
 
 ## License