Use uber import in docs. (#1026)

[cranst0n]

No description provided.

[non]

Love it! Thanks so much. 👍

[codecov-io]

Current coverage is 88.92%

Merging #1104 into master will not change coverage

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[ceedubs]

Oh fantastic @cranst0n. Thanks a bunch! Based on repeated Gitter questions, I think this will help a lot of people.

[cranst0n]

@ceedubs @non

I forgot to mention an issue that came up when making these changes. Specifically in optiont.md in the tut docs.

When I replaced the respective instances of import cats.std.future._ tut fails to compile it:

[tut] *** Error reported at optiont.md:69
<console>:25: error: ambiguous implicit values:
 both value catsStdBimonadForFunction0 in trait Function0Instances of type => cats.Bimonad[Function0]
 and value catsStdInstancesForList in trait ListInstances of type => cats.Traverse[List] with cats.MonadCombine[List] with cats.MonadRec[List] with cats.CoflatMap[List]
 match expected type cats.Applicative[F]
         l <- OptionT.fromOption(lastnameO)

I didn't make the change because of this reason but I suppose it should be addressed in some way?

[ceedubs]

@cranst0n oh thanks for the heads up. It looks like after changing the imports you need to change that line to OptionT.fromOption[Future](lastnameO). I'm not really sure why that is. I'd be inclined to go ahead and change to the uber imports and do that anyway.