Release 1.4.3 does not contain arm64 architecture

[chadmoone]

As of version 1.4.3, linking this library for arm64 architecture (eg run on device or build for archive) fails, due to the linker being unable to find an appropriate architecture in the framework:

Ignoring file /Users/moonec/development/my-app/Pods/Chartbeat/Chartbeat.framework/Chartbeat, missing required architecture arm64 in file /Users/moonec/development/my-app/Pods/Chartbeat/Chartbeat.framework/Chartbeat (2 slices)

Undefined symbol: _OBJC_CLASS_$_CBTracker

This was not encountered prior to updating to 1.4.3, and simply reverting the pod version to 1.4.2 resolves the issue.