don't run proposals.py step if in TravisCI environment

scripts/generate-matrix-org-assets

@@ -8,8 +8,11 @@ cd `dirname $0`/..
 
 mkdir -p assets
 
-# generate specification/proposals.rst
+if [ "$TRAVIS" != "true" ]
-./scripts/proposals.py
+then
+    # generate specification/proposals.rst
+    ./scripts/proposals.py
+fi
 
 # generate the spec docs
 ./scripts/gendoc.py -d assets/spec