Fix Typeable for inner classes

[joroKr21]

Fixes #748

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@491890e). Click here to learn what that means.
The diff coverage is 0%.

@@            Coverage Diff            @@
##             master     #798   +/-   ##
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  Coverage          ?   87.99%           
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  Files             ?       64           
  Lines             ?     1499           
  Branches          ?        4           
=========================================
  Hits              ?     1319           
  Misses            ?      180           
  Partials          ?        0

Impacted Files	Coverage Δ
core/src/main/scala/shapeless/typeable.scala	0% <0%> (ø)

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[milessabin]

Where do you see warnings?

[milessabin]

This LGTM ...

[joroKr21]

Thanks, had to rebase again because somehow lost the change from #861 but should be good now.