Add note about what this package does *not* do

This is based on a note in #1, which seems like an important and useful clarification :)

License: MIT
Signed-off-by: Rob Brackett <rob@robbrackett.com>

README.md

@@ -8,8 +8,7 @@
 
 > ipns record definitions
 
-This package contains all of components necessary to create, understand, and
-validate IPNS records.
+This package contains all of components necessary to create, understand, and validate IPNS records. It does *not* publish or resolve those records. [`go-ipfs`](https://github.com/ipfs/go-ipfs) uses this package internally to manipulate records.
 
 ## Usage