feat: support toml 1.1

[JP-Ellis]

Upgrade the toml crate to v1 which adds support for TOML 1.1. This now allows for newlines to be added to inline tables.

Fixes: #212

[SuperCuber]

Thank you for the contribution! Please set toml = "1.*" to follow pattern set by the rest of the dependencies.
Edit: actually it's inconsistent and doesn't matter much. disregard :)

[JP-Ellis]

I was about to make the change for consistency, but it is also equivalent:

https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#default-requirements

1.2.3  :=  >=1.2.3, <2.0.0
1.2    :=  >=1.2.0, <2.0.0
1      :=  >=1.0.0, <2.0.0
0.2.3  :=  >=0.2.3, <0.3.0
0.2    :=  >=0.2.0, <0.3.0
0.0.3  :=  >=0.0.3, <0.0.4
0.0    :=  >=0.0.0, <0.1.0
0      :=  >=0.0.0, <1.0.0

Thanks for the prompt approval and merge!