Type alias issue in Diesel 2.0

[developerworks]

Run the command to generate schema.rs

diesel print-schema --database-url=mysql://root:root@localhost/test > src/schema.rs

In the generated src/schema.rs file, type alias Bigint used as BigInt in diesel::sql_types::*, then
in the .proto file message filed is not recognized like this:

/* TODO: unknown type Bigint */ id = 1;

Output of diesel_ext --proto > myproto.proto

diesel_ext --proto > myproto.proto
Bigint is not recognized. Please feel free to expand the HashMap. This could provide good hints: https://kotiri.com/2018/01/31/postgresql-diesel-rust-types.html
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