Update the podspec to support all Swift versions#210

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lucdion merged 5 commits intomasterfrom

fix_podspec_for_swift_5.1.1

Oct 31, 2019

Commits on Oct 29, 2019

Removed `swift_version` from the podspec. PinLayout support all recents Swift versions, don't need to specify them individually.
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Commits on Oct 30, 2019