updating DIRECTORY.md

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github-actions 2021-05-04 14:46:10 +00:00
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* [Number Of Digits](https://github.com/TheAlgorithms/Ruby/blob/master/maths/number_of_digits.rb)
* [Power Of Two](https://github.com/TheAlgorithms/Ruby/blob/master/maths/power_of_two.rb)
* [Prime Number](https://github.com/TheAlgorithms/Ruby/blob/master/maths/prime_number.rb)
* [Roman To Integer](https://github.com/TheAlgorithms/Ruby/blob/master/maths/roman_to_integer.rb)
* [Square Root](https://github.com/TheAlgorithms/Ruby/blob/master/maths/square_root.rb)
* [Square Root Test](https://github.com/TheAlgorithms/Ruby/blob/master/maths/square_root_test.rb)
* [Sum Of Digits](https://github.com/TheAlgorithms/Ruby/blob/master/maths/sum_of_digits.rb)