Updated documentation

docs/index.adoc

@@ -17,6 +17,9 @@ simple to use API implementations and converters between JSON, XML.
 More information and source code can be found on the link:https://github.com/lightningj-org/lightningj[Github site].
 There it is possible to report issues and contribute code.
 
+If you are developing using the grails framework there is also a Grails 3.3+ plugin at
+link:http://grails.lightningj.org[]
+
 _Important_: This API is still in beta and API methods might change before real production release. +
 *All use of this library is on your own risk.*
 
@@ -33,7 +36,8 @@ to the license agreement can be found link:LICENSE.txt[here].
 
 == Whats New
 
-* 0.4-Beta : API generated from LDN rpc.proto for LND 0.4-Beta tag.
+* 0.4-Beta : API generated from LDN rpc.proto for LND 0.4-Beta tag. Also check out
+the new grails plugin as link:http://grails.lightningj.org[]
 * 0.3-Beta : Z-Base32 encoder/decoder, updated API to support new Wallet Seed generation.
 * 0.2-Beta : Added support for Macaroons authentication.
 * 0.1-Beta : This is the initial release with generated APIs (Synchronous and Asynchronous) for