1.1.1 added support for 'decapitalize'

New support for 'decapitalize':

LuckyCase.decapitalize(...)
LuckyCase.isDecapitalized(...)
LuckyCase.isNotCapital(...)
String.decapitalize(...)
String.isDecapitalized(...)
String.isNotCapital(...)

Allow lower case variants for parameter case_type at LuckyCase.convertCase and String.convertCase, e.g.:

// ####### already worked #######
LuckyCase.convertCase('myStringBingBangBong', LuckyCase.SNAKE_CASE);
// => "my_string_bing_bang_bong"
LuckyCase.convertCase('myStringBingBangBong', 'SNAKE_CASE');
// => "my_string_bing_bang_bong"

// ####### working now as well #######
LuckyCase.convertCase('myStringBingBangBong', 'snake_case');
// => "my_string_bing_bang_bong"