Upgrade pg-numeric to 1.0.2

[charmander]

Fixes an important correctness bug (https://github.com/charmander/pg-numeric/blob/master/CHANGELOG.md#102--2019-11-10).

[codecov-io]

Codecov Report

Merging #108 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #108   +/-   ##
=======================================
  Coverage   88.01%   88.01%           
=======================================
  Files           5        5           
  Lines         217      217           
=======================================
  Hits          191      191           
  Misses         26       26

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