chore: bump protobuf-build to 0.13 (#341)

Signed-off-by: Alex Chi <iskyzh@gmail.com>

Author: skyzh

tikv-client-proto/Cargo.toml

@@ -9,7 +9,7 @@ description = "Protobuf specs for the TiKV Rust client"
 build = "build.rs"
 
 [build-dependencies]
-protobuf-build = { version = "0.12", default-features = false, features = ["grpcio-prost-codec"] }
+protobuf-build = { version = "0.13", default-features = false, features = ["grpcio-prost-codec"] }
 
 [dependencies]
 protobuf = "2.8"