do not force to set setTitles() in a Builder

[hardysim]

from #28 (comment)

if needed I think the constructor would be a better place

[dvdciri]

Where am i forcing to set the title?

[hardysim]

The MultiChoiceToolbar#Builder() takes setTitles().
If I do not add this to the builder, it crashes with:

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.String.trim()' on a null object reference
at com.davidecirillo.multichoicerecyclerview.MultiChoiceToolbar.<init>(MultiChoiceToolbar.java:26)
at com.davidecirillo.multichoicerecyclerview.MultiChoiceToolbar.<init>(MultiChoiceToolbar.java:9)
at com.davidecirillo.multichoicerecyclerview.MultiChoiceToolbar$Builder.build(MultiChoiceToolbar.java:122)

In my understanding, a builder is the thing where I might add options (but I can leave them unset).
Am I wrong?

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This is not a bug - more like a architectural discussion ;-)

[dvdciri]

Correct, thanks for adding info, will fix this later