Swift Package Manager build of Amplitude-iOS 5.2.0 fails modulemap generation

**Checklist**
I've searched for existing GitHub issues
I've looked for existing answers on Stack Overflow
I've read the Code of Conduct
This issue is not security related and can safely be disclosed publicly on GitHub

**Environment**
Xcode Version: 11.5
Swift Version: 5.1 (if issue is Swift related)
Installation Platform & Version: [SPM] version 5.2

**Goals**
Importing Amplitude-iOS as a Swift Package into our private package.
.package(name: "Amplitude", url: "https://github.com/amplitude/Amplitude-iOS", .exact("5.2.0")),
Running "swift build" yields error:

Resolving https://github.com/amplitude/Amplitude-iOS at 5.2.0
**_error: target 'Amplitude' failed modulemap generation; umbrella header defined at '/Users//dev/MTIShared/build/checkouts/Amplitude-iOS/Sources/Amplitude/Amplitude.h', but directories exist: /Users//dev/MTIShared/build/checkouts/Amplitude-iOS/Sources/Amplitude/SSLCertificatePinning; consider removing them
[20:12:10]: Exit status: 1_**

Note that other packages import without issue.
Suggestions?

**Steps to Reproduce**
Create a package and import Amplitude-iOS

run `"swift build"`