Make zero work correctly for ComponentVector{Bool}

[jonniedie]

Fix #206

[codecov-commenter]

Codecov Report

Merging #213 (900455e) into master (904dbc5) will not change coverage.
The diff coverage is 100.00%.

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@@           Coverage Diff           @@
##           master     #213   +/-   ##
=======================================
  Coverage   73.00%   73.00%           
=======================================
  Files          20       20           
  Lines         689      689           
=======================================
  Hits          503      503           
  Misses        186      186           

Impacted Files	Coverage Δ
src/similar_convert_copy.jl	83.33% <100.00%> (ø)

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