Added bash and zsh autocompletion

[rsteube]

Added bash and zsh autocompletion generation using cobra. This is based on the currently ongoing PR by babysnakes which i forked to support zsh custom completion for positional arguments.
When babysnakes PR finally lands in cobra, the changes shouldn't differ too much.

The bash version simply completes the commands while the zsh one has some additional argument completion (like menu completion of issue numbers with their title).

• added Gopkg files (dep)
• fixated 2 dependencies to an older commit in lock file (build problem)
• changed cobra source to my personal fork
• added lab completion {bash,zsh} command
• added some initial positional argument completions using lab and git invocations

The remote argument of some commands is currently skipped. I started working on that, but this might be a good first iteration since most of it seems to work so far.

see #40
changes made in my cobra fork can be seen here: babysnakes/cobra@zsh-completion...rsteube:zsh-completion-custom

[rsteube]

Seems the build fails because it doesn't use dep: https://travis-ci.org/zaquestion/lab/builds/460512521#L498

[zaquestion]

Yeah we switch over to go modules recently. Likely you just need to upgrade to go1.11 and do something like GO111MODULE=on go build . and the go.mod file should get updated. Thanks for putting this together, I'll try to pick it up this weekend if we're still facing issues.

[codecov]

Codecov Report

Merging #252 into master will increase coverage by 0.02%.
The diff coverage is 70.37%.

@@            Coverage Diff             @@
##           master     #252      +/-   ##
==========================================
+ Coverage   68.32%   68.34%   +0.02%     
==========================================
  Files          42       43       +1     
  Lines        2251     2278      +27     
==========================================
+ Hits         1538     1557      +19     
- Misses        554      562       +8     
  Partials      159      159

Impacted Files	Coverage Δ
cmd/root.go	72.93% <ø> (ø)	⬆️
cmd/mr_approve.go	27.27% <100%> (+7.27%)	⬆️
cmd/project_list.go	93.1% <100%> (+0.24%)	⬆️
cmd/issue_close.go	100% <100%> (ø)	⬆️
cmd/mr_close.go	100% <100%> (ø)	⬆️
cmd/mr_browse.go	100% <100%> (ø)	⬆️
cmd/mr_show.go	100% <100%> (ø)	⬆️
cmd/mr_merge.go	30% <100%> (+7.77%)	⬆️
cmd/mr_thumb.go	27.27% <100%> (+7.27%)	⬆️
cmd/snippet_delete.go	73.33% <100%> (+1.9%)	⬆️
... and 8 more

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[rsteube]

Ah, didn't know about modules yet. I was looking for something like that but it seems i was blind and didn't expect the files to be called *.mod and *.sum. Added a replace instruction to the go.mod.