add --version flag to the install-miniver script

Author: jbweston

install-miniver

@@ -18,6 +18,7 @@ if sys.version_info < (3, 5):
 
 try:
     import miniver
+    _miniver_version = miniver.__version__
     del miniver
     _miniver_is_installed = True
 except ImportError:
@@ -122,6 +123,8 @@ def extract_miniver_from_local():
 def get_args():
     parser = argparse.ArgumentParser(
         description="Install 'miniver' into the current Python package")
+    parser.add_argument("-v", "--version", action="version",
+                        version=_miniver_version)
     parser.add_argument('package_directory',
                         help="Directory to install 'miniver' into.")
     return parser.parse_args().package_directory