0.2.2-pre release asset is not a tar.gz

[agateau]

Hi, thanks for kdotool, it's really useful now that I am switching to Wayland.

I wanted to add it to Clyde, a package manager I maintain, but the package fails because the kdotool.tar.gz release asset is actually a tar file, not a tar.gz. Here is the output of the file command on it:

$ file kdotool.tar.gz 
kdotool.tar.gz: POSIX tar archive (GNU)

Compare with the output for the 0.2.1 release:

$ file kdotool-0.2.1.tar.gz
kdotool-0.2.1.tar.gz: gzip compressed data, from Unix, original size modulo 2^32 1976320

Also, it would be helpful to include the architecture used for the binaries in the name of the release asset, something like this: kdotool-0.2.2-x86_64.tar.gz.