remove redundant imports and clone (found by clippy)

[matthiaskrgr]

No description provided.

[pksunkara]

Umm, they are not redundant imports. We have several features. You probably didn't run clippy with --all-features.

[matthiaskrgr]

The imports are redundant because in the code because the full import paths are already specified.
If we use &yaml_rust::yaml::Hash, there is no need to import yaml_rust.

https://rust-lang.github.io/rust-clippy/master/index.html#single_component_path_imports

cargo check --all-targets --all-features passes locally (I also cargo checked all the features one by one manually, no failures)

[pksunkara]

Just one minor issue

[pksunkara]

bors r+

[bors]

🕐 Waiting for PR status (Github check) to be set, probably by CI. Bors will automatically try to run when all required PR statuses are set.

[bors]

Build succeeded

• clap-rs.clap
• continuous-integration/travis-ci/push