Update readme/changelog

Author: Seldaek

CHANGELOG.mdown

@@ -1,3 +1,8 @@
+### 1.3.0 (2014-09-05)
+
+  * Added parsing to an associative array via JsonParser::PARSE_TO_ASSOC
+  * Fixed a warning when rendering parse errors on empty lines
+
 ### 1.2.0 (2014-07-20)
 
   * Added support for linting multiple files at once in bin/jsonlint

README.mdown

@@ -32,9 +32,13 @@ $parser->parse($json);
 Installation
 ------------
 
+For a quick install with Composer use:
+
+    $ composer require seld/jsonlint
+
 JSON Lint can easily be used within another app if you have a
 [PSR-4](https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-4-autoloader.md)
-autoloader, or it can be installed through [Composer](http://packagist.org/)
+autoloader, or it can be installed through [Composer](https://getcomposer.org/)
 for use as a CLI util.
 Once installed via Composer you can run the following command to lint a json file or URL: