Make the README more GitHub friendly.

README.md

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+ocaml-debian-formats - Parse debian files
+=========================================
+
+[![Travis status][travis-img]][travis]
+
+This library allows to parse various files used in Debian packaging:
+* changelog files
+* source and binary control files
+* watch files
+
+[travis]:         https://travis-ci.org/gildor478/ocaml-debian-formats
+[travis-img]:     https://travis-ci.org/gildor478/ocaml-debian-formats.svg?branch=master
+[opam]:           https://opam.ocaml.org
+
+Installation
+------------
+
+The recommended way to install ocaml-debian-formats is via the [opam package manager][opam]:
+
+```sh
+$ opam install debian-formats
+```
+
+Documentation
+-------------
+
+* API documentation is
+  [available online](https://gildor478.github.io/ocaml-debian-formats).