increment version.

setup.py

 from setuptools import setup
 
 setup(name='solventmapcreator',
-      version='1.2.0',
+      version='1.2.1',
       description='python scripts for generating solvent maps and analysing solvation curves.',
       url='https://bitbucket.org/mdd31/solventmapcreator',
       author='Mark Driver',