message: List all valid actions in config error message
diff: @@ -399,7 +399,7 @@ impl<'a> de::Deserialize<'a> for ActionWrapper {
  type Value = ActionWrapper;
  fn expecting(&self, f: &mut fmt::Formatter) -> fmt::Result {
  - f.write_str("Paste, Copy, PasteSelection, or Quit")
  + f.write_str("Paste, Copy, PasteSelection, IncreaseFontSize, DecreaseFontSize, ResetFontSize, or Quit")
  }
  fn visit_str<E>(self, value: &str) -> ::std::result::Result<ActionWrapper, E>
  