scripts: Add --commands to update_version

doc/changelog.asciidoc

@@ -32,7 +32,7 @@ Added
   * `hints.padding` to add additional padding for hints.
   * `hints.radius` to set a border radius for hints (set to `3` by default).
 - New placeholders for `url.searchengines` values:
-  * `{unquoted}` inserts the search term without any quoting
+  * `{unquoted}` inserts the search term without any quoting.
   * `{semiquoted}` (same as `{}`) quotes most special characters, but slashes
     remain unquoted.
   * `{quoted}` (same as `{}` in earlier releases) also quotes slashes.

scripts/dev/update_version.py

@@ -52,11 +52,15 @@ if __name__ == "__main__":
     parser.add_argument('bump', action="store",
                         choices=["major", "minor", "patch"],
                         help="Update release version")
+    parser.add_argument('--commands', action="store_true",
+                        help="Only show commands to run post-release.")
     args = parser.parse_args()
 
     utils.change_cwd()
-    bump_version(args.bump)
-    show_commit()
+
+    if not args.commands:
+        bump_version(args.bump)
+        show_commit()
 
     import qutebrowser
     version = qutebrowser.__version__