v2.3.1

• removed C++11 requirement as R already supports higher C++ standards
• updated autoconfig files
• polished documentation

v2.3.0

• implemented str.fsets(), as_tibble.fsets()
• removed dependency on the zoo package
• added lowerBound() algebra for missing values

v2.2.1

• implemented the experimental Center of Gravity defuzzification method (defuzz())
• added "a few" and "several" fuzzy quantifiers to the quantifier() function

v2.2.0

Updated DESCRIPTION

v2.1.2

Updated xcode version in .travis.yml

v2.1.1

Incremented version

v2.1.0

Updated description

v2.0.1

Tagged version 2.0.1