SwiftLinkPreview
                                
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                        fix/session-delegate
Fixed f84740e01002e6806c03984b19bef0bb2d85e893
SwiftLinkPreview destroys and recreates the URLSession, causing the user to lose control over the session he gave to SwiftLinkPreview (ie. his delegate will stop working & his session invalidation will be ignored).
this PR is based on #159. The only commit in this PR that is relevant is f84740e01002e6806c03984b19bef0bb2d85e893