flowconfig improvements (#349)
flowconfig improvements (#349)

* Remove unneeded `esproposal.class_static_fields` config

This was enabled by default in Flow 0.32.0.

* Ignore untyped high churn directories

lawliet89/yarn,mgcrea/yarn,dguo/yarn,seripap/emojiless-yarn,mourner/yarn,CHECK24/yarn,andreypopp/esy,andreypopp/esy,ConAntonakos/yarn,dguo/yarn,onemen/yarn,mourner/yarn,MiguelAlho/yarn,mvestergaard/yarn,MiguelAlho/yarn,mvestergaard/yarn,andreypopp/esy,bsansouci/esy,FLGMwt/yarn,CHECK24/yarn,seripap/emojiless-yarn,lawliet89/yarn,troydemonbreun/yarn,suitupalex/yarn,bsansouci/esy,suitupalex/yarn,joeyespo/yarn,FLGMwt/yarn,bsansouci/esy,kasperlewau/yarn,ConAntonakos/yarn,kasperlewau/yarn,troydemonbreun/yarn,dxu/yarn,onemen/yarn,dxu/yarn,joeyespo/yarn,mgcrea/yarn