[fix] adding a correct init file

[suut]

that way we do: import aioimaplib instead of from aioimaplib import aioimaplib to achieve the correct result, because the __init__.py file was empty, nothing was imported at the module level.

[coveralls]

Coverage increased (+0.004%) to 93.905% when pulling 3d656dbe02a9a852b55f509fd4959572d6d51406 on suut:master into 393b48c5ca88de089b3ef126c3ff929374f9bf9f on bamthomas:master.

[bamthomas]

Thank you