3.1

• add List.combine_chop and corresponding (and&) synchronized product

• chore: remove travis to use github CI instead

• add CCList.mguard function for list comprehensions

• add some basic tests to CCMutHeap

• un-specify order of elements in CCMap.to_list

• Move definition of CCMap.update so that it is shadowed by Stdlib.Map.update

• fix(intmap): order of arguments for the HO param should be stable

• feat(containers-data): add CCMutHeap mutable heap with increase/decrease