get-developers: use --cc instead of --to for developers

Output of get-developers script in our manual uses --cc for developers,
but actual output of get-developers script uses --to. This patch makes
code consistent with documentation, by using --cc for developers.

Signed-off-by: Rahul Bedarkar <rahul.bedarkar@imgtec.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

support/scripts/get-developers

@@ -74,7 +74,7 @@ def __main__():
 
         result = "--to buildroot@buildroot.org"
         for dev in matching_devs:
-            result += " --to \"%s\"" % dev
+            result += " --cc \"%s\"" % dev
 
         if result != "":
             print("git send-email %s" % result)