Describe the bug
App will terminate with the following message:

Message from debugger: Terminated due to signal 5

This occurs on the line that instantiates a RollbarPLCrashCollector:

let crashCollector = RollbarPLCrashCollector()

To Reproduce
Steps to reproduce the behavior:

1. Add RollbarNotifier, RollbarPLCrashReporter, RollbarSwift cocopods v2.0.0-beta9 to Podfile, install
2. Add sample Swift code from docs into AppDelegate:

import RollbarNotifier
import RollbarPLCrashReporter
...
func application(_ application: UIApplication,
                     didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    let config = RollbarConfig()
    config.destination.accessToken = "..."
    config.destination.environment = "..."
    let crashCollector = RollbarPLCrashCollector()
    Rollbar.initWithConfiguration(config, crashCollector: crashCollector)
    ....
}

Expected behavior
App will launch successfully.

Screenshots
N/A

Rollbar-Apple SDK version: v2.0.0-beta9

Calling the SDK from (x-mark all suitable):
[] Objective-C
[x] Swift
[] Other:

Runtime environment (please complete the following information as applicable):

• Device: MacBook Pro 16"/iOS Simulator iPhone 12
• OS: iOS
• OS version: 14.3