Auto merge of #4481 - behnam:travis, r=alexcrichton
authorbors <bors@rust-lang.org>
Fri, 22 Sep 2017 14:34:26 +0000 (14:34 +0000)
committerbors <bors@rust-lang.org>
Fri, 22 Sep 2017 14:34:26 +0000 (14:34 +0000)
commit9c849fe0fde9bfdb20a5ad3043e53adfb1c0cc56
tree896aebac54df9e694e58803a338b4aa1318a139b
parente01fae40b6840fd49ae05cac3ec069a19685b140
parent0971aac7cd29e073dddfe0cdbf38eb0a9304adcb
Auto merge of #4481 - behnam:travis, r=alexcrichton

[travis] Enable cache for $HOME/.cargo

This should accelerate the `cargo install mdbook` step under `install`,
which is currently called on all linux+nightly setups.

https://github.com/rust-lang/cargo/blob/36ddeff03a31f710095cfbe49287503bb60e294d/.travis.yml#L24-L25