Does not support dotted keys from toml 0.5

[Nemo157]

> cargo new bar
Created binary (application) `bar` package
> cd bar
> echo 'futures.version = "0.3.5"' >>Cargo.toml
> cargo add futures-test
Command failed due to unhandled error: Unable to parse Cargo.toml

Caused by: Manifest not valid TOML
Caused by: TOML parse error at line 10, column 8
   |
10 | futures.version = "0.3.5"
   |        ^
Unexpected `.`
Expected `=`

[ordian]

This feature is currently not supported in toml_edit toml-rs/toml#58.

[ordian]

Support for dotted keys has been added to toml_edit thanks to @epage. Once we cut a release and update it in cargo-edit, this issue will be resolved.