Update Travis CI configuration after syntax change

Closes: #145

Author: Albin Stjerna

.travis.yml

@@ -22,4 +22,4 @@ script:
 env:
   RUSTINFRA_DEPLOY_DIR: book/book
 import:
-  - rust-lang/simpleinfra/travis-configs/static-websites.yml
+  - rust-lang/simpleinfra:travis-configs/static-websites.yml