message: replace match be if let
diff: @@ -97,8 +97,7 @@ impl IndyLogger {
  file: IndyCString,
  line: u32) {
  unsafe {
  - match LOGGER {
  - Some(ref logger) => {
  + if let Some(ref logger) = LOGGER {
  let target = c_str_to_string(target).unwrap().unwrap();
  let args = c_str_to_string(args).unwrap().unwrap();
  let module_path = c_str_to_string(module_path).unwrap();
  @@ -116,17 +115,12 @@ impl IndyLogger {
  .build(),
  );
  }
  - None => {}
  - }
  }
  }
  pub extern fn flush_cb(_context: *const CVoid) {
  unsafe {
  - match LOGGER {
  - Some(ref logger) => { logger.flush() }
  - None => {}
  - }
  + if let Some(ref logger) = LOGGER { logger.flush() }
  }
  }
  