perty 0.0.1

A implementation of the Programme Evaluation and Review Technique (PERT).
Documentation 
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"id","optimistic_time","most_likely_time","pessimistic_time","depends_on"
"A","2.0","4.0","6.0",""
"B","3.0","5.0","9.0",""
"C","4.0","5.0","7.0",""
"D","4.0","6.0","10.0","A"
"E","4.0","5.0","7.0","B,C"
"F","3.0","4.0","8.0","D"
"G","3.0","5.0","8.0","E"