[travis] Enable cache for $HOME/.cargo/bin/
authorBehnam Esfahbod <behnam@zwnj.org>
Mon, 11 Sep 2017 00:45:59 +0000 (17:45 -0700)
committerBehnam Esfahbod <behnam@zwnj.org>
Fri, 22 Sep 2017 08:02:18 +0000 (01:02 -0700)
commit0971aac7cd29e073dddfe0cdbf38eb0a9304adcb
tree896aebac54df9e694e58803a338b4aa1318a139b
parente01fae40b6840fd49ae05cac3ec069a19685b140
[travis] Enable cache for $HOME/.cargo/bin/

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