Noted minimum Eclipse version Neon in README

Change-Id: I4fc54ea27351b748880d39adffe7b9f7774ad714

README.md

diff --git a/README.md b/README.md
index 6102a91..7255d51 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,8 @@
 The update site for protobuf-dt is
 http://google.github.io/protobuf-dt/updates/latest/.
 
+As of version 2.3.0, the Protocol Buffer requires Eclipse Neon or greater.
+
 ### Install using Eclipse Install tool
 Navigate to "Help" > "Install New Software...".