chore(travis): pipe git commands to dev null

.travis/docs.sh

@@ -13,7 +13,7 @@ done
 cp --parent ./doc/**/*.html ./target
 cp ./doc/guide.css ./target/doc/guide/guide.css
 
-git clone --branch gh-pages "https://$TOKEN@github.com/${TRAVIS_REPO_SLUG}.git" deploy_docs
+git clone --branch gh-pages "https://$TOKEN@github.com/${TRAVIS_REPO_SLUG}.git" deploy_docs > /dev/null 2>&1
 cd deploy_docs
 
 git config user.name "Sean McArthur"
@@ -38,4 +38,8 @@ fi
 
 git add -A .
 git commit -m "rebuild pages at ${TRAVIS_COMMIT}"
-git push --quiet origin gh-pages
+git push --quiet origin gh-pages > /dev/null 2>&1
+echo
+echo "Docs published."
+echo
+