New requirement for client version

Now require version 2.0.0 of the client and won't allow old
versions without the client header.

config/settings/base.py

@@ -38,10 +38,10 @@ MANAGERS = ADMINS
 
 # Client versions allowed - pip-like specifier strings,
 # can be multiple (comma-separated)
-ALLOWED_CLIENT_VERSIONS = '>=1.29.dev1'
+ALLOWED_CLIENT_VERSIONS = '>=2.0.0'
 # Allow requests to API without user-agent header specified
 # Temporary fix while we transition
-ALLOW_BLANK_USER_AGENT_TO_API = True
+ALLOW_BLANK_USER_AGENT_TO_API = False
 
 # Use forwarded host header for Apache -> Gunicorn reverse proxy configuration
 USE_X_FORWARDED_HOST = True