Fixup completions + add one for zsh

Signed-off-by: Igor Raits <ignatenkobrain@fedoraproject.org>

rust-git-delta.spec

@@ -45,6 +45,9 @@ License:        MIT and ASL 2.0 and BSD and ISC and LGPLv3+ and zlib
 %dir %{_datadir}/bash-completion
 %dir %{_datadir}/bash-completion/completions
 %{_datadir}/bash-completion/completions/delta.bash
+%dir %{_datadir}/zsh
+%dir %{_datadir}/zsh/site-functions
+%{_datadir}/zsh/site-functions/_delta
 
 %prep
 %autosetup -n %{crate}-%{version_no_tilde} -p1
@@ -58,8 +61,10 @@ License:        MIT and ASL 2.0 and BSD and ISC and LGPLv3+ and zlib
 
 %install
 %cargo_install
-install -Dpm0644 completion/bash/completion.sh \
+install -Dpm0644 etc/completion/completion.bash \
   -T %{buildroot}%{_datadir}/bash-completion/completions/delta.bash
+install -Dpm0644 etc/completion/completion.zsh \
+  -T %{buildroot}%{_datadir}/zsh/site-functions/_delta
 
 %if %{with check}
 %check