Supports inner imports within @service macro.

[juanpedromoreno]

This PR makes possible to have inner imports within the annotated @service trait:

@service
    trait RPCService[F[_]] {
      import ExternalScope._

      @rpc(Protobuf)
      def scope(empty: Empty.type): F[External]
    }

It also releases a new patch version -> 0.5.1.

[codecov-io]

Codecov Report

Merging #101 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #101   +/-   ##
=======================================
  Coverage   83.45%   83.45%           
=======================================
  Files          12       12           
  Lines         139      139           
=======================================
  Hits          116      116           
  Misses         23       23

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