Fix target entry in .gitignore

[rukai]

The directories at:

• https://github.com/rust-lang/cargo/tree/master/tests/testsuite/cargo_remove/target
• https://github.com/rust-lang/cargo/tree/master/tests/testsuite/cargo_add/target

Are getting picked up by the target entry in .gitignore, causing git to ignore any extra files added to those directories. A minor issue I know, but I still think its worth fixing.

Alternative

An alternative solution would be to rename those directories which I'm more than happy to do. But I think we are better off just changing .gitignore as that is more future proof.

[rustbot]

r? @ehuss

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[weihanglo]

@bors r+

[bors]

:pushpin: Commit 433635b9fe720cf7d11d2de52dc6b24548790cd1 has been approved by weihanglo

It is now in the queue for this repository.

[bors]

:hourglass: Testing commit 433635b9fe720cf7d11d2de52dc6b24548790cd1 with merge 080869e835d4843075201482b0c80fcf143a870a...

[bors]

:sunny: Test successful - checks-actions Approved by: weihanglo Pushing 080869e835d4843075201482b0c80fcf143a870a to master...