i have used sieve of Eratosthenes Update prime_numbers.py

[Nerdgirl50]

basically let assum we have [1...6] so it is obvious that if 6 isdiv by 6 then it can't be a prime number which will result less time complexcity

Describe your change:

All new algorithms include at least one URL that points to Wikipedia or another similar explanation.
Fix a bug or typo in an existing algorithm?

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[algorithms-keeper]

Closing this pull request as invalid

@Nerdgirl50, this pull request is being closed as none of the checkboxes have been marked. It is important that you go through the checklist and mark the ones relevant to this pull request. Please read the Contributing guidelines.

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