message: LoadingError and InstanceError now only format their inner value
  Addressing PR feedback
diff: @@ -46,7 +46,9 @@ pub enum LoadingError {
  impl fmt::Display for LoadingError {
  fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
  - write!(f, "LoadingError::{:?}", self)
  + match self {
  + LoadingError::LibraryLoadError(e) => write!(f, "{}", e),
  + }
  }
  }
  @@ -60,7 +62,10 @@ pub enum InstanceError {
  impl fmt::Display for InstanceError {
  fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
  - write!(f, "InstanceError::{:?}", self)
  + match self {
  + InstanceError::LoadError(e) => write!(f, "{}", e.join("; ")),
  + InstanceError::VkError(e) => write!(f, "{}", e),
  + }
  }
  }
  