bump version to 0.30

Author: yuja

setup.py

@@ -6,7 +6,7 @@
 
 setup(
     name='sphinxcontrib-plantuml',
-    version='0.29',
+    version='0.30',
     url='https://github.com/sphinx-contrib/plantuml/',
     download_url='https://pypi.python.org/pypi/sphinxcontrib-plantuml',
     license='BSD',