Sevntu Checkstyle 1.13.6

[Roman Ivanov]

Sevntu Checkstyle 1.13.6

http://sevntu-checkstyle.github.io/sevntu.checkstyle/#1.13.6

Fix for bugs:

LogicConditionNeedOptimizationCheck doesn't give violation when it is expected.
AvoidNotShortCircuitOperatorsForBooleanCheck: NullPointerException occurred during the analysis.
Cannot set property 'blockTypes' in module ChildBlockLength.