Merge branch 'master' into udpate_cocoapods

Author: lucdion

Sources/Impl/UIView+FlexLayout.swift

@@ -16,7 +16,7 @@ import UIKit
 
 private var flexLayoutAssociatedObjectHandle = 72_399_923
 
-public extension UIView {
+extension UIView {
     public var flex: Flex {
         if let flex = objc_getAssociatedObject(self, &flexLayoutAssociatedObjectHandle) as? Flex {
             return flex