hash mismatch when running `nix develop`

[Rob Brewer]

I ran nix develop and got the following message:

error: --- Error ---------------------------------------------------------------------------------------------------------------------------- nix
hash mismatch in fixed-output derivation '/nix/store/5pb8dycgqsrspqg7kpdsp0fchnb5f9d6-channel-rust-stable.toml.drv':
  specified: sha256-7zt+rHZxx+ha4P/UnT2aNIuBtjPkejVI2PycAt+Apiw=
     got:    sha256-KCh2UBGtdlBJ/4UOqZlxUtcyefv7MH1neoVNV4z0nWs=
(use '--show-trace' to show detailed location information)

I'm running NixOS 20.09 with flake support enabled.

[Andika Demas Riyandi]

@rbrewer123 thank you for the report. Basically, you can just switch the specified with the got section. I'll try to make sure the sha256 is updated.