Improve build speed

Using yarn on Travis requires a `yarn.lock` file, even though I can see that we can run it without the file.
0xarash · May 22, 2018 · ece9efd · ece9efd
1 parent c995e91
commit ece9efd
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diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,7 @@
 language: node_js
+cache: yarn
 node_js:
 - "8"
 install:
-- yarn
+- yarn install
 script: gitbook install && gitbook build