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Chao Sun authored and Antoine Pitrou committed 5a29ab8d93f
ARROW-2563: [Rust] Poor caching in Travis-CI Author: Chao Sun <sunchao@apache.org> Closes #2021 from sunchao/arrow-2563 and squashes the following commits: a65dd84 <Chao Sun> fix merge coverage report issue 43aa206 <Chao Sun> ARROW-2563: Poor caching in Travis-CI