Update lockfile

[harens]

Hopefully closes #853.

Update the lockfile to match cargo.toml.

[ariasuni]

Please update Rust’s version to 1.45.0 in .travis.yml and README.md, like I did in #857. You updated the git2 version, and now it needs at least Rust 1.45.0.

[harens]

Thank you for your response @ariasuni (and for your work on this project).

I left it as a separate commit so as not to get too much in the way of #857, and so that it's possible to only cherry pick my original commit if desired.

[ariasuni]

Don’t worry, I’ll rebase my pull request after I merge this. I’m just waiting for the CI checks to finish.

[ariasuni]

Let’s depend on Rust 1.45.2 since it the latest 1.45.x and it fixes bugs. Also, the link to the Rust blog was incorrect.

[ariasuni]

Aaaand it’s done! \o/ Also:

Thank you for your response @ariasuni (and for your work on this project).

I’m glad my work is useful and appreciated :)

[harens]

Thank you for merging! 🎉 (and for correcting my mistakes...)