add announcement.

README.md

@@ -1,5 +1,15 @@
 # README #
 
+## !!IMPORTANT!!
+
+In the next version, I'll be moving the `i2pkeys` directory to it's own repository
+so I can avoid import cycle headaches. Please migrate to the new `i2pkeys` repository
+before upgrading your sam3 dependencies. You can probably do this by running:
+
+```sh
+find . -name '*.go' -exec sed -i 's|github.com/eyedeekay/sam3/i2pkeys|github.com/eyedeekay/i2pkeys|g' {} \;
+```
+
 go library for the I2P [SAMv3.0](https://geti2p.net/en/docs/api/samv3) bridge, used to build anonymous/pseudonymous end-to-end encrypted sockets.
 
 This library is much better than ccondom (that use BOB), much more stable and much easier to maintain.