fix conditional in until loop

work towards issue #48

wait-for-synapse.sh

@@ -17,7 +17,7 @@ host="$1"
 # This is done for `exec "$@"` below to work correctly
 shift
 
-until [ "200" == $(curl -s -o /dev/null --head -w "%{http_code}" https://${host}/_matrix/client/versions) ]; do
+until [ "200" -eq $(curl -s -o /dev/null --head -w "%{http_code}" https://${host}/_matrix/client/versions) ]; do
     >&2 echo "synapse is unavailable - sleeping"
     sleep 3
 done