add "cache: cargo" to travis config (significantly faster build times) #92
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I looked through the history of the travis config file and the project issues and saw nothing to indicate this has already been tried - so I'm assuming there is no obvious reason not to do this?
Enable the cargo build cache in travis config file.
This caches
$HOME/.cargoand$TRAVIS_BUILD_DIR/targetdirs so we can avoid having to recompile all libs each time.https://docs.travis-ci.com/user/caching/#Rust-Cargo-cache
Before -
After (with cache) -
See travis-ci/travis-ci#4470 for some details of why this should be safe even across multiple rust versions (cache is separated by rust version and branch).