Added Travis-CI status to 'README.md'

README.md

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-Haskell library for the BSON encoding. Used in MongoDB.
-BSON documents are JSON-like objects with a standard binary encoding.
-A BSON Document is serialized to a standard binary encoding defined at <http://bsonspec.org>. This implements version 1 of that spec.
+bson-haskell [![Build Status](https://secure.travis-ci.org/selectel/bson-haskell.png)](http://travis-ci.org/selectel/bson-haskell)
+------------
 
-A BSON Document is an untyped (dynamically type-checked) record. I.e. it is a list of name-value pairs, where a Value is a single sum type with constructors for basic types (Bool, Int, Float, String, and Time), compound types (List, and (embedded) Document), and special types (Binary, Javascript, ObjectId, RegEx, and a few others).
+Haskell library for the encoding and decoding BSON documents, which are
+JSON-like objects with a standard binary encoding, defined at
+<http://bsonspec.org>. This library implements version 1 of that spec.
+
+A BSON Document is an untyped (dynamically type-checked) record. I.e. it
+is a list of name-value pairs, where a Value is a single sum type with
+constructors for basic types (Bool, Int, Float, String, and Time),
+compound types (List, and (embedded) Document), and special types
+(Binary, Javascript, ObjectId, RegEx, and a few others).