0.12.1.

0.12.0, Rust 1.20 compatible release.

Revert "Don't install unnecessary packages on Travis CI Android builds."

This reverts commit 52c645b.

0.10.0.

0.9.6.

0.9.7.

0.9.5.

0.9.4: Implement `Copy`, `Clone`, and `Debug` for `hmac::Signature`.

0.9.3: Prevent multiple copies of *ring* from being linked.

This will only protect against linking multiple copies of version from
0.9.3 onward; i.e. it won't prevent a version like 0.7.6 from being
linked alongside 0.9.3.

0.9.2.