Add python3-dev(el) to bindep.txt

This commit adds python3-dev and python3-devel to bindep.txt. This is
necessary for python3 environment.

Change-Id: I843984b6e26aa3eb9926fd7f72ad8d246ffd96a8
diff --git a/bindep.txt b/bindep.txt
index 6a28348..8914ade 100644
--- a/bindep.txt
+++ b/bindep.txt
@@ -7,5 +7,7 @@
 gcc [platform:dpkg]
 python-dev [platform:dpkg]
 python-devel [platform:rpm]
+python3-dev [platform:dpkg]
+python3-devel [platform:rpm]
 openssl-devel [platform:rpm]
 libssl-dev [platform:dpkg]