Add timestampFlag docs

[drov0]

Reason for this PR is that it makes the CI fail until #987 is merged

[saschagrunert]

I'll approve if the CI is working and the related PR got merged :)

[asahasrabuddhe]

This won't pass until the changes that have been merged are tagged. When gfmrun tries to execute the code, it pulls the v2.0.0 which currently does not have this change. I am thinking of a way to fix this once and for all because everytime we have a new feature, this problem is going to recur.

Now we have two ways to move forward, make a release with a feature without having the documentation supporting the feature or, to just merge this as it's only documentation and we all know the exact reason for the CI failure.

[coilysiren]

I am thinking of a way to fix this once and for all because everytime we have a new feature, this problem is going to recur.

From a functionality point of view, this is what I would like => #1006

make a release with a feature without having the documentation supporting the feature

This is my preference for the time being 👍

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@21ae70f). Click here to learn what that means.
The diff coverage is 61.53%.

@@            Coverage Diff            @@
##             master     #997   +/-   ##
=========================================
  Coverage          ?   72.83%           
=========================================
  Files             ?       33           
  Lines             ?     2474           
  Branches          ?        0           
=========================================
  Hits              ?     1802           
  Misses            ?      565           
  Partials          ?      107

Impacted Files	Coverage Δ
app.go	78.71% <ø> (ø)
altsrc/flag_generated.go	64.28% <ø> (ø)
context.go	95.45% <ø> (ø)
altsrc/map_input_source.go	52.85% <ø> (ø)
altsrc/json_source_context.go	19.83% <0%> (ø)
flag.go	86.22% <100%> (ø)
flag_string.go	88.88% <100%> (ø)
flag_duration.go	70% <100%> (ø)
flag_int_slice.go	74.62% <100%> (ø)
flag_string_slice.go	79.66% <100%> (ø)
... and 11 more

---

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[asahasrabuddhe]

Finally this works! Phew

[saschagrunert]

Hey 👋, I just found some formatting nits. 👇