adding classifiers

Allowing python 3.5+

Merge pull request #16 from rlishtaba/feature/dijkstras

adding dijkstra SP algorithm

Merge pull request #15 from rlishtaba/feature/algorithms

Adding new algorithms

Merge pull request #14 from rlishtaba/feature/graph-algos

Feature/graph algos

Adding comments to readme file

Updating readme.

Tagging as v0.20.0

Merge pull request #10 from rlishtaba/feature/challenges-and-tasks

Feature/challenges and tasks

Adding Quick Sort algorithm