enumerable#find_index
Implement Symbol#swapcase
Implement Symbol#intern
Merge pull request #582 from kostya/find_index

enumerable#find_index
AUTHORS.rst += Jan Stępień
Merge pull request #589 from jstepien/jan-wrote-some-code

Adding some new UTF-8 code points to `AUTHORS.rst`
Merge pull request #586 from kachick/implement-symbol-intern

Implement Symbol#intern
Merge pull request #585 from kachick/implement-symbol-swapcase

Implement Symbol#swapcase
Implement Symbol#capitalize