gdk compile errors

[mmstick]

error: failed to compile `rrun v0.2.1 (https://github.com/buster/rrun#fe6dccdf)`, intermediate artifacts can be found at `/tmp/cargo-install.HGmFlrkrPQNs`

Caused by:
  Multiple packages link to native library `gdk`. A native library can be linked only once.

Package `gdk-sys v0.3.4`
    ... which is depended on by `gdk v0.5.3`
    ... which is depended on by `gtk v0.1.3`
    ... which is depended on by `rrun v0.2.1 (https://github.com/buster/rrun#fe6dccdf)`
links to native library `gdk`.

Package `gdk-sys v0.5.0`
    ... which is depended on by `gdk v0.7.0`
    ... which is depended on by `rrun v0.2.1 (https://github.com/buster/rrun#fe6dccdf)`
also links to native library `gdk`.

[buster]

@mmstick

rrun builds fine on my machine. Nevertheless some update on the regex crate seems to have broken it.
I fixed it and released v0.2.2..