Make toggleCalendar method return true on opening

[xuhcc]

So we can use it like that:

const opened = datepicker.toggleCalendar()
if (opened) {
    ...
}

[codecov-io]

Codecov Report

Merging #23 into master will increase coverage by 0.01%. The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #23      +/-   ##
=========================================
+ Coverage   93.18%   93.2%   +0.01%     
=========================================
  Files          20      20              
  Lines        1116    1118       +2     
  Branches      235     235              
=========================================
+ Hits         1040    1042       +2     
  Misses         76      76

Impacted Files	Coverage Δ
...mydatepicker/src/lib/angular-mydatepicker.input.ts	89.82% <100%> (+0.07%)	:arrow_up:

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[kekeh]

You can use calendarToggle callback: https://github.com/kekeh/angular-mydatepicker#calendartoggle-callback

Example: https://github.com/kekeh/angular-mydatepicker/wiki/calendarToggle-callback

[xuhcc]

I know, but I would prefer to use returned value as it better suits my needs.

[kekeh]

Ok. I merged this PR. Install latest version from npm.

The return value only indicates was the operation open or close. The close operation is always asychronous if calendar animations are used so in that case the toggleCalendar() may return before the calendar has closed.

[xuhcc]

Thanks!