Bump version to v0.2.0

Author: isuruf

setup.py

@@ -177,7 +177,7 @@ def run(self):
 integration with SymPy and Sage.'''
 
 setup(name = "symengine",
-      version="0.1.0.dev",
+      version="0.2.0",
       description = "Python library providing wrappers to SymEngine",
       setup_requires = ['cython>=0.19.1'],
       long_description = long_description,