Regression between 1.4.1 and 1.7.0

[bkozik]

We were able to scan code39 codes such as the below with version 1.4.1. We ran into a pretty big issue when 1.7.0 started being used and no codes were detected on iOS or android. We've had to pin the package to 1.4.1, as mentioned in #109 it would be nice if there were tests for this kind of thing on new package releases. Let me know if you need any more information!