Fix the formatting in the changelog
# Unreleased
-- Add web support via the 'stdweb' or 'web-sys' features
+- Add web support via the 'stdweb' or 'web-sys' features
- On macOS, implement `run_return`.
- On iOS, fix inverted parameter in `set_prefers_home_indicator_hidden`.
- On X11, performance is improved when rapidly calling `Window::set_cursor_icon`.
