Skips cleanup

I cannot for the life of me figure out why this is the default other
than to save Travis space when people have huge artifacts.

.travis.yml

@@ -10,6 +10,7 @@ deploy:
     secure: mz4/p8VB7qn6F3M8uPT2/mJmU/nEWRGgsxN+KM/Gg1isSVrRpWP0xYfPTOdU6o9f0IVBRIW7SjHuq1H9kqGhmWx+Aycs8gE905ORYidLRjbkPN/fiS2jL6CcRzolkprvK7btIRhxfFGB/y3L0MELh+kXo1A6oIm+2a+OwNpdi4c=
   file: optar-*.tar.gz
   file_glob: true
+  skip_cleanup: true
   on:
     repo: colindean/optar
     tags: true