Fix cache cargo

gnzlbg · gnzlbg · commit d59deae968cd · 2019-05-25T14:21:23.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,10 +1,7 @@
 language: rust
 sudo: false
 rust: nightly
-cache:
-  directories:
-    - $HOME/.cargo/.crates.toml
-    - $HOME/.cargo/bin/mdbook
+cache: cargo
 install: cargo install mdbook
 script: bash -c "cd reference && mdbook build && mdbook test"
 env:
