GR6J correction

[Dr-Jamie-Brown]

Very well done creating this working GR package for python.

I found a slight error in the GR6J.rs file whilst trying to compare hydrogr to the airgr R version. in line 116 the it should read exp_flow = x6*ar.exp(); and not exp_flow = x6/ar.exp(); . The issue creates extremely large flows when states[2]/x6 drops below -33 which in turn allows the exp_flow to become a extremely high. A simple error but has large modelling implications.

[SimonDelmas]

Thank you very much for your feedback. I am currently traveling, but I will correct this when I return.

[SimonDelmas]

Fixed in version 1.2.1, thanks @Dr-Jamie-Brown !

[Dr-Jamie-Brown]

Thanks @SimonDelmas Very much appreciated