Shebang in first line

Change-Id: Ica298516fa2f4af8fc0ace5d050bd8ab3fe5ac2b
diff --git a/scripts/install.sh b/scripts/install.sh
index 12df621..d037910 100755
--- a/scripts/install.sh
+++ b/scripts/install.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 
 # Copyright 2017-present Open Networking Foundation
 #
@@ -13,9 +14,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-
-#!/usr/bin/env bash
-
 # Mininet install script for Ubuntu (and Debian Wheezy+)
 # Brandon Heller (brandonh@stanford.edu)