Bumped the min deployment target to iOS 9+, Xcode to Xcode 11

[dreampiggy]

See more: SDWebImage/SDWebImage#3130

[codecov]

Codecov Report

Merging #13 (a98186d) into master (68f6054) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #13   +/-   ##
=======================================
  Coverage   74.61%   74.61%           
=======================================
  Files           2        2           
  Lines         130      130           
=======================================
  Hits           97       97           
  Misses         33       33           

Flag	Coverage Δ
iOS	74.61% <ø> (ø)

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