Install rustfmt in travis so binding errors are comprehensible (#70)

alex · reaperhulk · commit 4e99b4f60ef1 · 2019-04-27T19:50:37.000-05:00
diff --git a/.travis.yml b/.travis.yml
@@ -21,7 +21,7 @@ install:
       else
           cargo install --force cargo-xbuild
       fi
-    - rustup component add rust-src
+    - rustup component add rust-src rustfmt
 
 script:
     - ./tests/run_tests.py
