Python 3.10: Threading related deprecations

[tirkarthi]

Using camelcase methods have been deprecated in Python 3.10

Ref : python/cpython#25174

currentThread -> current_thread getName -> name

rg -t py -w 'currentThread|notifyAll|activeCount|isDaemon|setDaemon'
twiggy/lib/__init__.py
7:    return threading.currentThread().getName()