Rx1513

Remove mention of the nightly compiler

1

 According to current version of cargo-fuzz it is not required anymore.

Bad non-descriptive error message in src/error.rs in invalid_cargo_config function

2

I'm currently packaging cargo upgrade and bumped into "[Invalid cargo config](https://github.com/killercup/cargo-edit/blob/master/src/errors.rs#L81)" error during running tests. And it created like ton of questions: What is this even supposed to mean? Like...

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https://github.com/theacodes/cmarkgfm/blob/master/src/cmarkgfm/build_cmark.py