Add `Slack::BlockKit::Elements::UrlTextInput`

[dimerman]

Closes: #159

[codecov[bot]]

Codecov Report

Merging #164 (0881992) into master (e0ce0eb) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #164      +/-   ##
==========================================
+ Coverage   99.09%   99.11%   +0.01%     
==========================================
  Files          42       43       +1     
  Lines         883      902      +19     
==========================================
+ Hits          875      894      +19     
  Misses          8        8              

Impacted Files	Coverage Δ
lib/slack/block_kit/element/url_text_input.rb	100.00% <100.00%> (ø)
lib/slack/block_kit/layout/input.rb	100.00% <100.00%> (ø)

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[CGA1123]

Thanks @dimerman -- sorry for the delay, i'm on holiday with limited connectivity! 😄

[CGA1123]

Finally got around to closing of #162 & #161 and have released those along with this change as 0.21.0.

Thanks for your contribution 🙇‍♂️