message: remove to_string() from semver version
diff: @@ -29,7 +29,7 @@ fn main() {
  if detected_version.major < 2 {
  panic!(
  "The GDAL crate requires a GDAL version >= 2.0.0. Found {}",
  - detected_version.to_string()
  + detected_version
  );
  }
  