in README.md changed some instructions what to install for python wrapper

Samo Penic

2016-05-15 08d2f85fef9e58d9f4fd3e787e7a950f9007fdb4

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Original written by Dan Kroll in FORTRAN. Code was then largely adapted and commented by Miha Fosnaric-Fosni. Rewritten into C by Samo Penic-Peni, with help of Miha's extensive explanations.