Xcode 10.2 and Swift 5.0 stop working on UnitTests

[Tayphoon]

New Issue Checklist

• [x] I have tried with the latest version of OHHTTPStubs
• [x] I have read the README
• [x] I have read the Using the right Swift Version of OHHTTPStubs for your project section
• [x] I have searched in the existing issues
• [x] I have read the OHHTTPStubs wiki to see if there wasn't a detailed page talking about my issue

Environment

• version of OHHTTPStubs: 6.1.0
• integration method you are using:
  • [x] Cocoapods
  • [ ] Carthage
  • [ ] submodule
  • [ ] other
• version of the tool you use: Cocoapods 1.5.3

Issue Description

When we move our project to Xcode 10.2 and Swift 5 some http requests stop working, instead of stubbing it goes to real server. System: macOS Mojave 10.14.4.

[Tayphoon]

I think this is our problem with async code...