Bumped version to 2.1 for release

Author: aspotton

setup.py

@@ -11,7 +11,7 @@
     version = '2.1',
     license = 'LICENSE.txt',
     url = 'https://github.com/webshrinker/webshrinker-sdk-python',
-    download_url = 'https://github.com/webshrinker/webshrinker-sdk-python/tarball/2.0',
+    download_url = 'https://github.com/webshrinker/webshrinker-sdk-python/tarball/2.1',
     install_requires = [
         "requests >= 2.8.1",
         "requests[security]"