fix doctr command

Author: ocefpaf

.travis.yml

@@ -72,7 +72,7 @@ script:
       pushd docs
       make clean html linkcheck
       popd
-      python -m doctr deploy --key-path github_deploy_key.enc --built-docs docs/build/html .
+      python -m doctr deploy . --key-path github_deploy_key.enc --built-docs docs/build/html/
     fi
 
 doctr: