Push registry after registrations by default.

[GunnarFarneback]

Change the default of the push keyword argument to register from false to true. Cf #30.

[codecov-commenter]

Codecov Report

Merging #36 (44a8f26) into master (9f4a4f1) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #36   +/-   ##
=======================================
  Coverage   98.31%   98.31%           
=======================================
  Files           1        1           
  Lines         178      178           
=======================================
  Hits          175      175           
  Misses          3        3           

Impacted Files	Coverage Δ
src/LocalRegistry.jl	98.31% <ø> (ø)

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