Dear sbt, please update.

Author: J0B10

.travis.yml

@@ -13,7 +13,7 @@ cache:
     - $HOME/.sbt
 before_install:
   - git clone https://github.com/codeoverflow-org/chatoverflow-api --branch master --single-branch --depth 1 api
-  - sbt ++$TRAVIS_SCALA_VERSION reload
+  - sbt ++$TRAVIS_SCALA_VERSION update
 script:
   - sbt ++$TRAVIS_SCALA_VERSION -Dfile.encoding=UTF8 doc
   - chmod +x .scripts/update-docs.sh