Add pypy travis target

        Pypy build compatibility - make exception classes regular python classes

Resolves #16

Author: Pan

.travis.yml

@@ -10,6 +10,7 @@ python:
   - 3.4
   - 3.5
   - 3.6
+  - pypy
 addons:
   apt:
     packages:

Changelog.rst

@@ -1,6 +1,19 @@
 Change Log
 =============
 
+0.7.0
+++++++
+
+Changes
+---------
+
+* Exceptions moved from C-API to Python module
+
+Fixes
+------
+
+* PyPy build support
+
 0.6.0
 ++++++