Release version v0.2.1

(I managed to mess up the commit for v0.2.0, it's not actually on
master. This is identical to v0.2.0 other than some updated pypi
classifiers.)

setup.py

@@ -10,7 +10,7 @@
 
 setup(
     name='json2cmake',
-    version='0.1.1',
+    version='0.2.1',
     description='Generate CMakeLists.txt from a compile_commands.json',
     long_description=long_description,
     url='https://github.com/AbigailBuccaneer/json2cmake',
@@ -19,7 +19,7 @@
 
 
     classifiers=[
-        'Development Status :: 3 - Alpha',
+        'Development Status :: 4 - Beta',
 
         'Intended Audience :: Developers',
         'Topic :: Software Development :: Build Tools',
@@ -33,6 +33,7 @@
         'Programming Language :: Python :: 3.3',
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: 3.6',
     ],
     keywords='c c++ cmake development',
     packages=find_packages(),