Releases 0.3.0

[juanpedromoreno]

It includes breaking features, given that from now on, the @rpc annotation requires the type of serialization (either Protobuf or Avro).

[codecov-io]

Codecov Report

Merging #82 into master will increase coverage by 0.81%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #82      +/-   ##
==========================================
+ Coverage   89.34%   90.16%   +0.81%     
==========================================
  Files          12       12              
  Lines         122      122              
==========================================
+ Hits          109      110       +1     
+ Misses         13       12       -1

Impacted Files	Coverage Δ
rpc/src/main/scala/internal/service/calls.scala	85.71% <0%> (+3.57%)	⬆️

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