Disclose minimum supported Rust version (MSRV) information in readme

[ceyhunsen]

Proposal Description

Some users might use older versions of Rust compiler and they might not be supported. It is needed to disclose MSRV in readme.

This accident has happened before on Docker environment.

• https://github.com/foresterre/cargo-msrv

[malikrohail]

assign me

[ceyhunsen]

Hey @malikrohail, thanks for the interest. This issue is currently not assigned to any of our teammates and I can't assign any other people to this issue. But you are welcome to open a PR that solves this issue; We are open to contributors.