Cleanups to the install scripts. (#103)

This bring rqt_reconfigure in line with the rest of the rqt
tools.

Signed-off-by: Chris Lalancette <clalancette@openrobotics.org>

setup.cfg

@@ -1,4 +1,4 @@
 [develop]
-script-dir=$base/lib/rqt_reconfigure
+script_dir=$base/lib/rqt_reconfigure
 [install]
-install-scripts=$base/lib/rqt_reconfigure
+install_scripts=$base/lib/rqt_reconfigure

setup.py

@@ -1,13 +1,5 @@
-#!/usr/bin/env python3
-import sys
-
 from setuptools import setup
 
-
-if sys.version_info < (3, 5):
-    print('ament requires Python 3.5 or higher.', file=sys.stderr)
-    sys.exit(1)
-
 package_name = 'rqt_reconfigure'
 setup(
     name=package_name,