Add an agenda item to discuss the proxy-wasm proposal. (#254)

Author: sunfishcode

meetings/2020/WASI-04-09.md

@@ -28,5 +28,8 @@ Installation is required, see the calendar invite.
 1. Proposals and discussions
     1. Moving to a CG-style phases process:
        https://github.com/WebAssembly/WASI/pull/252
+    1. Proxy-wasm
+        1. Vote: approve for Phase 1 (see previous item)?
+        1. Discussion: Next steps.
 
 ## Meeting Notes