Add a setup method for the "is_persistent" field of the ReplyKeyboardMarkup object

[pavel-mironchik]

This PR just "adds" a convenient method for setting the is_persistent field which was introduced in the Bot API 6.4:

Added the field is_persistent to the class ReplyKeyboardMarkup, allowing to control when the keyboard is shown.

P.S. One could already use the setIsPersistent() method, but with this change, it will be shown by the autocomplete system of an IDE.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (45a15ca) 43.56% compared to head (8d4dc5e) 43.56%.

Additional details and impacted files

@@            Coverage Diff            @@
##                3.x    #1063   +/-   ##
=========================================
  Coverage     43.56%   43.56%           
  Complexity      603      603           
=========================================
  Files           129      129           
  Lines          1795     1795           
=========================================
  Hits            782      782           
  Misses         1013     1013           

Impacted Files	Coverage Δ
src/Keyboard/Keyboard.php	0.00% <ø> (ø)

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.

[irazasyed]

Thanks