add cleanup downloaded dependencies on bin/download.sh.
diff --git a/bin/download.sh b/bin/download.sh
index 7674351..3ca14c1 100644
--- a/bin/download.sh
+++ b/bin/download.sh
@@ -11,4 +11,7 @@
tar xvzf mysql-connector-java-5.1.39.tar.gz
cp mysql-connector-java-5.*/mysql-connector-java-5.*-bin.jar s2core/lib/
-cp mysql-connector-java-5.*/mysql-connector-java-5.*-bin.jar s2counter_core/lib/
\ No newline at end of file
+cp mysql-connector-java-5.*/mysql-connector-java-5.*-bin.jar s2counter_core/lib/
+
+
+rm -rf mysql-connector-java-5.*
\ No newline at end of file
