[NO ISSUE] Updated out-of-date information in README

- user model changes: no
- storage format changes: no
- interface changes: no

Details:
- Updated the path of start-sample-cluster.sh in README

Change-Id: If8a4884c0a59ded2388416bfca3359108a19f67a
Reviewed-on: https://asterix-gerrit.ics.uci.edu/3114
Reviewed-by: Michael Blow <mblow@apache.org>
Tested-by: Michael Blow <mblow@apache.org>
Contrib: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Ian Maxon <imaxon@apache.org>
diff --git a/README.md b/README.md
index e1a2d5a..a555946 100644
--- a/README.md
+++ b/README.md
@@ -78,7 +78,7 @@
 
 * Start a single-machine AsterixDB instance:
 
-        $cd asterixdb/asterix-server/target/asterix-server-*-binary-assembly/
+        $cd asterixdb/asterix-server/target/asterix-server-*-binary-assembly/apache-asterixdb-*-SNAPSHOT
         $./opt/local/bin/start-sample-cluster.sh
 
 * Good to go and run queries in your browser at: