additional array methods

[t1user]

Would you be open to add some additional methods on Array class? While using eventkit with ib_insync, it would be helpful to have some basic indicators built in. I'm currently missing equivalent to pandas.ewm, pandas.diff, atr, rsi, but gradually more could be added. I could take a crack at it and send a PR, the question is whether you see it as part of the package or should I just make an extension?

[erdewit]

If it uses plain numpy then it can be included into eventkit. If it uses pandas then I would suggest to create an extension package.