AMQCLI-1 Small tweak to the README

Update some wording in the README
diff --git a/activemq-kahadb-exporter/README.md b/activemq-kahadb-exporter/README.md
index 7bcacf5..006bc96 100644
--- a/activemq-kahadb-exporter/README.md
+++ b/activemq-kahadb-exporter/README.md
@@ -3,5 +3,6 @@
 
 The ActiveMQ KahaDB exporter project provides tooling used to export the
 ActiveMQ 5.x Broker's native KahaDB message store which can be consumed by
-other tooling such as import into the ActiveMQ Artemis broker's native format.
+other tooling such as import into the ActiveMQ Artemis broker's native format
+to aid with broker migration.