Updating the changelog

CHANGELOG.md

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+Infinity Squared changelog
+==========================
+
+2.0 (March 2015)
+----------------
+* New, more spaced out design.
+  * SVG based Retina graphics, based on Font Awesome.
+  * Custom social sharing buttons.
+  * Nicer, larger font.
+  * Mobile first design.
+  * Improved error page. Now it has an actual footer, and the errors can be more easily displayed using the `display_error()` function.
+* Decent antispam system. If the user is logged in, antispam protection is ommited. If not, reCAPTCHA keys can be supplied for Google's new tick-CAPTCHA to be used. If both of those are failed, basic fill-box protection is used.
+* Shunned jQuery.
+* Shunned the dependency on the soon-to-be deprecated Google Charts API, in favour of PHP QR Code.
+* Using a different ZeroClipboard script and updating it's settings to more reliably find copy material.
+* Dependency system for scripts, so scripts like ZeroClipboard are not loaded where they're not needed, such as on the index page. Dependencies are added to the `dependencies[]` array, and then if the dependency is in the array during loading, the script is loaded.
+* Updated POT.
+* Corrected all of the settings code in `index.php` and `results.php`. It should now more reliably detect whether settings are enabled or not.
+
+1.6 (January 2014)
+------------------
+* reCAPTCHA support.
+* Single new bookmarklet.
+* Custom CSS styling which will not be overwritten on upgrade.
+
+1.5 (August 2013)
+-----------------
+Big changes:
+* Internationalisation! See Wiki for instructions on how to use Infinity Squared in your language and translate it for other people to use.
+* A proper CSS mobile interface. When I tried to add internationalisation, it quickly became apparent that having two code bases was stupid.
+
+Bug fixes:
+* HTML5 doctype
+* Upgraded to qTip2
+* Including jQuery and qTip from CDN
+* No longer loading G+ code if it's not enabled
+* Parallel loading of scripts thanks to Chrome's audits
+* Rearranged the CSS so that it's more readable
+
+Many thanks to [Ozh](http://ozh.org) for help with internationalisation
+
+1.4 (February 2013)
+-------------------
+* Bookmarklets updated to the code relevant to YOURLS 1.6
+* Added CSS animation to the main menu
+* Updated jQuery to 1.9.1 (included with YOURLS 1.6)
+* Updated qTip² and Formalize.me so they're compatible with the new version of jQuery
+* Added a few more comments to the code so it's easier to modify it
+* Improved the readability of the documentation by moving over to Markdown
+* Usual assortment of bug fixed, cleaned up code etc.
+
+1.3 (August 2012)
+-----------------
+* Added a mobile version of the theme which can be disabled in the config file
+* Discreet gradient in the menu
+* New Google+ sharer
+* Bookmarklet code updated with code with YOURLS 1.5
+* Usual assortment of bug fixes, cleaned up code etc.