tiny docs update

CHANGELOG.md

+v0.1.9:
+  date: 2015-05-14
+  changes:
+    - `customize` replaced with `extend`
+    - docs improved
 v0.1.8:
   date: 2015-05-13
   changes:

README.md

@@ -2,9 +2,11 @@
 
 [![Build Status](https://travis-ci.org/pateketrueke/json-schema-faker.png?branch=master)](https://travis-ci.org/pateketrueke/json-schema-faker)
 [![NPM version](https://badge.fury.io/js/json-schema-faker.png)](http://badge.fury.io/js/json-schema-faker)
-[![Dependency Status](https://david-dm.org/pateketrueke/json-schema-faker.svg)](https://david-dm.org/pateketrueke/json-schema-faker)
 [![Coverage Status](https://coveralls.io/repos/pateketrueke/json-schema-faker/badge.png?branch=master)](https://coveralls.io/r/pateketrueke/json-schema-faker?branch=master)
 
+[![Dependency Status](https://david-dm.org/pateketrueke/json-schema-faker/status.svg)](https://david-dm.org/pateketrueke/json-schema-faker)
+[![devDependency Status](https://david-dm.org/pateketrueke/json-schema-faker/dev-status.svg)](https://david-dm.org/pateketrueke/json-schema-faker#info=devDependencies)
+
 Use [JSON Schema](http://json-schema.org/) along with fake generators to provide consistent fake data for your system. Note that `json-schema-faker` supports (currently) the JSON-Schema specification **draft-04** only.
 
 ## Online demo