Try to use links in README.

README.md

@@ -42,7 +42,8 @@ running:
     as described in <http://doi.acm.org/10.1145/2818638>.
 * The folder `proofmode` contains the Iris proof mode, which extends Coq with
   contexts for persistent and spatial Iris assertions. It also contains tactics
-  for interactive proofs in Iris. Documentation can be found in `ProofMode.md`.
+  for interactive proofs in Iris. Documentation can be found in
+  [`ProofMode.md`](ProofMode.md).
 * The folder `tests` contains modules we use to test our infrastructure.
   Users of the Iris Coq library should *not* depend on these modules; they may
   change or disappear without any notice.
@@ -50,4 +51,4 @@ running:
 ## Documentation
 
 A LaTeX version of the core logic definitions and some derived forms is
-available in `docs/iris.tex`.
+available in [`docs/iris.tex`](docs/iris.tex).