Synchronous API should be deprecated/removed.

[yglukhov]

It is distracting, useless, untested, and can lure some users into using it, and migrating from sync to async takes some time, so why not start with async in the first place. Oh, also it is a maintenance burden :)

[timotheecour]

just saw your post after submitting #63 ; for the maintenance (+ testing) burden, #63 could help

[timotheecour]

@yglukhov how would I translate this to async?

  for ai in mc.find(query).limit(2).items():
    echo ai

EDIT: see 3ada6cd for my approach to this