Regenerate *.rs files in `src/proto/`

for new protobuf version 2.15.0

src/proto/fileformat.rs

-// This file is generated by rust-protobuf 2.14.0. Do not edit
+// This file is generated by rust-protobuf 2.15.0. Do not edit
 // @generated
 
 // https://github.com/rust-lang/rust-clippy/issues/702
 #![allow(unknown_lints)]
 #![allow(clippy::all)]
 
-#![cfg_attr(rustfmt, rustfmt_skip)]
+#![allow(unused_attributes)]
+#![rustfmt::skip]
 
 #![allow(box_pointers)]
 #![allow(dead_code)]
 
 /// Generated files are compatible only with the same version
 /// of protobuf runtime.
-// const _PROTOBUF_VERSION_CHECK: () = ::protobuf::VERSION_2_14_0;
+// const _PROTOBUF_VERSION_CHECK: () = ::protobuf::VERSION_2_15_0;
 
 #[derive(PartialEq,Clone,Default,Debug)]
 pub struct Blob {

src/proto/osmformat.rs

-// This file is generated by rust-protobuf 2.14.0. Do not edit
+// This file is generated by rust-protobuf 2.15.0. Do not edit
 // @generated
 
 // https://github.com/rust-lang/rust-clippy/issues/702
 #![allow(unknown_lints)]
 #![allow(clippy::all)]
 
-#![cfg_attr(rustfmt, rustfmt_skip)]
+#![allow(unused_attributes)]
+#![rustfmt::skip]
 
 #![allow(box_pointers)]
 #![allow(dead_code)]
 
 /// Generated files are compatible only with the same version
 /// of protobuf runtime.
-// const _PROTOBUF_VERSION_CHECK: () = ::protobuf::VERSION_2_14_0;
+// const _PROTOBUF_VERSION_CHECK: () = ::protobuf::VERSION_2_15_0;
 
 #[derive(PartialEq,Clone,Default,Debug)]
 pub struct HeaderBlock {