minor noop config/deps tweaks

app.yaml

@@ -1,4 +1,4 @@
-# https://cloud.google.com/appengine/docs/standard/python/config/appref
+# https://cloud.google.com/appengine/docs/standard/reference/app-yaml?tab=python
 
 # application: bridgy-federated
 

requirements.txt

@@ -3,7 +3,6 @@ git+https://github.com/snarfed/carbox.git#egg=carbox
 git+https://github.com/snarfed/dag-json.git#egg=dag_json
 git+https://github.com/dvska/gdata-python3.git#egg=gdata
 git+https://github.com/snarfed/granary.git#egg=granary
-git+https://github.com/snarfed/dag-json.git#egg=dag_json
 git+https://github.com/snarfed/httpsig.git@HTTPSignatureAuth-sign-header#egg=httpsig
 git+https://github.com/snarfed/lexrpc.git#egg=lexrpc
 git+https://github.com/snarfed/mox3.git#egg=mox3