[elpa] externals/crdt 2f1ebd7 1/2: Update README.org, ask ppl to use same version.

[ELPA Syncer]

branch: externals/crdt
commit 2f1ebd733cf1f759d345abb36da4aa1de1638044
Author: Qiantan Hong <qhong@mit.edu>
Commit: Qiantan Hong <qhong@mit.edu>

    Update README.org, ask ppl to use same version.
---
 README.org | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/README.org b/README.org
index 0a3d681..0576dad 100644
--- a/README.org
+++ b/README.org
@@ -16,6 +16,13 @@ Highlights:
 
 ~crdt.el~ is now on GNU ELPA! Just =M-x package-install crdt=.
 
+*Caution!!!* Please make sure that you and your peers are on the same 
~crdt.el~ version!
+It turns out to be one of the most common causes of ~crdt.el~ not working.
+Because currently the network protocol is not stablized, behavior when using 
mismatched versions is unexpectable.
+- Strictly speaking, it should works when =crdt-protocol-version= are defined 
and the same on all peers.
+  But why not save some hassle and keep everyone on the latest version.
+- To upgrade, just =M-x package-reinstall crdt=, then preferably restart Emacs.
+
 ** Start a shared session
 
 A shared session is a place that can contains multiple buffers (or files),