Pin wptserve to latest version 3.0
diff --git a/annotation-protocol/requirements.txt b/annotation-protocol/requirements.txt
index f800ea0..3a66d74 100644
--- a/annotation-protocol/requirements.txt
+++ b/annotation-protocol/requirements.txt
@@ -1 +1 @@
-wptserve
+wptserve==3.0