rc: update default max-statements to 25

[Raynos]

I add an overwrite rule on almost every project to bump this to 25.

I've found 25 to work a lot better and every time i get this warning i truly feel like i've got a too big method.

However the 15 limit is really low and easy to hit into.

r: @Matt-Esch @malandrew @jcorbin

[Raynos]

Also cc @Willyham

[andrewdeandrade]

LGTM.