Change log for release 1.0.6

[RobFryer]

Updated change log for next release

[annelaerkes]

Same comments here. I am confused about the p level of the non-linear component and the overall_trend. Is the p value for the smooth model not the one given in the output as the p_non_linear? But in the text it seems to be the p_overall_trend.
I understand that the text is correct and I just don't understand what is going on but if I don't understand the logic, maybe others won't either?

[RobFryer]

@hallareinert @annelaerkes
I've added some more explanation to the change log. Does this make more sense? I'll wait until I hear from you before I go back to the statistical interpretation pull request.
I'm conscious that I need to document properly all the columns that come out in the summary table. But that is quite a big job and I'll leave that for a later date. However, I could put in some more explanations about where the p-values come from in the statistical interpretation. I could also explicitly say what the chosen model is and which criteria was used to choose it. What do you think? (I've had questions from some AMAP users about the p-values, so there is a demand for it.) It would be a bit of work, but not nearly so much as documenting the full summary table.