IfType type guards

[ZachHaber]

The readme mentions that there should be a corresponding IfType guard for every IsType check.

For every IsT type (e.g. IsAny), there is an associated IfT type that can help simplify conditional types.

I'm only seeing a few IfType guards in the package (IfNever, IfAny, and IfUnknown).

Potential fixes (that I can think of at the moment):

1. Add the missing IfType guards
2. Update the readme to specifically call out those three guards

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[sindresorhus]

PR welcome for types starting with Is that are missing an If type.

[sindresorhus]

I'm starting to question whether it was the correct choice to add If equivalents. It seemed nice at first, but there is now so many extra types and all of them require extra docs and maintenance. Maybe we should instead have supported the extra parameters on Is* or just referred people to a If type. Thoughts?

// @ikelax