Update SDK version to 1.0.38
Update SDK version to 1.0.38

* Allow to start attempt on end date is null.
* Hide retake button in test report of course content attempt.
* Discard exam details from exam SDK if exam details is already shown
in course content detail.
* Show start button instead on retake if attempts count is 0.

testpress/android,testpress/android,testpress/android,testpress/android,testpress/android