Fixes URL in wptest-cli-install.sh

[franz-josef-kaiser]

Fixed the URL for the bash/shell to pull the right file contents. Fixes "not a valid WXR file" error when trying to run the script. Fixes #31

[manovotny]

So this alters what @GaryJones did just a week ago in #30.

I don't use the WordPress CLI, so I have no idea what is going on here and I don't want to keep blindly accepting pull requests flopping back and forth.

Can someone kindly explain to me what the difference is between all these URLs and how it's helps / hurts the WordPress CLI?

[GaryJones]

My URL forwards on to the one @franz-josef-kaiser gave (try https://github.com/manovotny/wptest/raw/master/wptest.xml and see where you end up), and it worked for me. I purposely avoided using the resulting URL, in case GH kept the long-standing raw (my) URL, and later changed it to something else.

If it's causing an error for someone else though, of course, go ahead and accept it.

[franz-josef-kaiser]

@GaryJones yes, it seemed to not redirect for me on Ubuntu 12.04 LTS. At least targetting the file directly helped.

@manovotny That one doesn't alter what WP-CLI does, but only changes the curl target. You can try the result from your local shell. If you don't have curl, maybe it can be replicated using wget.

[manovotny]

Ok, we'll roll with this pull request as it takes you directly to the resolved URL.

Please let me know if you experience any issues after doing so.