chore: update license references

Sam Harrison · Sam Harrison · commit 3062112627fe · 2020-10-27T16:47:09.000-05:00
diff --git a/MANIFEST.in b/MANIFEST.in
@@ -1,3 +1,3 @@
 # Include the SSL certificate file in the package distributed by pip
 recursive-include twilio/conf *
-include LICENSE.md
+include LICENSE
