title: Module compiled with Swift 4.2.1 cannot be imported by the Swift 5.0 compiler
body: <p>I am trying to implement integration of third party app into project as per instruciton <a href="https://github.com/Paytm-Payments/Paytm_iOS_App_Kit/tree/master/Swift/BitCodeDisabled/PaytmNativeSDK" rel="noreferrer">https://github.com/Paytm-Payments/Paytm_iOS_App_Kit/tree/master/Swift/BitCodeDisabled/PaytmNativeSDK</a></p>
  
  <p>I see the following error in build </p>
  
  <blockquote>
    <p>Module compiled with Swift 4.2.1 cannot be imported by the Swift 5.0
    compiler</p>
  </blockquote>
  
  <p>I have tried toolchains <a href="https://medium.com/xcblog/switching-swift-versions-inside-xcode-using-toolchains-755b28831c43" rel="noreferrer">https://medium.com/xcblog/switching-swift-versions-inside-xcode-using-toolchains-755b28831c43</a>
  The error changes to Reason: Incompatible library version: PaytmNativeSDK requires version 1.0.0 or later, but libswiftCore.dylib provides version 0.0.0</p>
  
  <p>How do i setup XCode or the Library to make it work . There is no chance of the vendor updating the library for Swift 5.0 and make it available on POD.</p>