Merge pull request #207 from mithro/mux-json-fix Fix JSON for muxes using udp_mux_4to2.

diff --git a/docs/conf.py b/docs/conf.py
index c88cc23..b817d54 100644
--- a/docs/conf.py
+++ b/docs/conf.py

@@ -199,6 +199,7 @@
 
     # Hide the symbiflow links
     'hide_symbiflow_links': True,
+    'license_url' : 'https://www.apache.org/licenses/LICENSE-2.0',
 }
 
 # Add any paths that contain custom static files (such as style sheets) here,