Toned down the log verbosity

Michael-F-Bryan · nikomatsakis · commit e288d043b298 · 2018-01-31T11:34:10.000-05:00
diff --git a/.travis.yml b/.travis.yml
@@ -5,7 +5,7 @@ install:
 - source ~/.cargo/env || true
 - bash ci/install.sh
 script:
-- RUST_LOG=debug mdbook build
+- mdbook build
 notifications:
   email:
     on_success: never
