From: Behnam Esfahbod <behnam@zwnj.org>
Date: Mon, 11 Sep 2017 00:45:59 +0000 (-0700)
Subject: [travis] Enable cache for $HOME/.cargo/bin/
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[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.
---

diff --git a/.travis.yml b/.travis.yml
index b925208bc..c2f7ca36c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,6 +6,10 @@ dist: trusty
 git:
   depth: 1
 
+cache:
+  directories:
+    - $HOME/.cargo/bin/
+
 matrix:
   include:
     - env: TARGET=x86_64-unknown-linux-gnu
@@ -22,7 +26,7 @@ matrix:
            ALT=i686-unknown-linux-gnu
       rust: nightly
       install:
-        - cargo install mdbook
+        - mdbook --help || cargo install mdbook --force
       script:
         - cargo test
         - cargo doc --no-deps