parameter1 attribute not set for fit.powerlaw

[henrymartin1]

Hey, I am using the library for a few days now and its really great and very helpful, thank you for this!
I encountered the following small error: The attribute parameter1 of the Fit class is not set for fit.power_law

As far as I understood the parameters of a fitted library can be accessed via its specific name (e.g., fit.power_law.alpha) or by the parameter1 attribute to facilitate accessing parameters of different distributions. Currently the attributes parameter1 and parameter1_name are not set for the power_law distribution.

fit = powerlaw.Fit(data)
assert fit.power_law.parameter1 == fit.power_law.alpha
assert fit.power_law.parameter1_name == 'alpha'

[jeffalstott]

@henrymartin1 Thanks for this and the other issues. If you or others submit a backwards-compatible pull request to address this I'll merge it in. If it's not backwards compatible it will take a moment's thought.