Update changelog for 0.3

Author: waveform80

docs/changelog.rst

@@ -5,6 +5,22 @@ Change log
 ==========
 
 
+Release 0.3 (2014-09-01)
+========================
+
+* Added a comprehensive test suite and fixed several small bugs as a result
+  (all to do with invalid file handling) (`#2`_)
+* Added an mmap emulation to enable reading of massive files on 32-bit systems;
+  the emulation is necessarily slower than "proper" mmap but that's the cost
+  of staying on 32-bit! (`#6`_)
+* Extended the warning and error hierarchy so that users of the library can
+  fine tune exactly what warnings they want to consider errors (`#3`_)
+
+.. _#2: https://github.com/waveform80/compoundfiles/issues/2
+.. _#3: https://github.com/waveform80/compoundfiles/issues/3
+.. _#6: https://github.com/waveform80/compoundfiles/issues/6
+
+
 Release 0.2 (2014-04-23)
 ========================