importify

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Creating because of the following reddit thread. https://www.reddit.com/r/haskell/comments/7777df/hack_importify_by_serokell_during_hacktoberfest/dojxjx1/?context=10000

An example:

1. Initial file:

   main = print "hello"
   

2. Then manually changed to:

   main = print =<< getCurrentTime
   

3. Then the following import is automatically added:

   import Data.Time (getCurrentTime)
   
   main = print =<< getCurrentTime
   

I wrote this in the comment section to other issue but this issue description looks better so I close previous issue as duplicate.

Thanks for creating issue! But first we need to simply support adding imports... There's such tool halberd which can add missing imports. But it's not maintained. And its interface is not very convenient...