killercup / cargo-edit / 198

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Auto merge of #46 - rgardner:rm-section-after-last-dep, r=killercup

Remove manifest section after its last dependency has been removed

This also adds another assert to the doctest, a unit test in src/manifest.rs, and an integration test in tests/cargo-rm.rs

This is checklist item 5 as part of #28.

I'd love suggestions on how to do this better:
```rust
if let Some(b) = section.get().as_table().and_then(|x| Some(x.is_empty())) {
    if b {
        section.remove();
    }
};
```

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