Support InitialValues 0.3

[tkf]

• Merge Remove reduce_empty(::AdjoinIdentity, ::Type) JuliaFolds/InitialValues.jl#64
• Update repo-rev

[codecov]

Codecov Report

Merging #189 (4a5456a) into master (f8fa366) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #189   +/-   ##
=======================================
  Coverage   73.90%   73.90%           
=======================================
  Files          11       11           
  Lines         571      571           
=======================================
  Hits          422      422           
  Misses        149      149           

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