upgrade pg for compatibility with node v14

[hallettj]

This project is such a cool idea! I'm planning to use it to run tests in my project, and to spin up a clean database for TypeORM to use as a point of reference for automatically generating migrations.

There is a problem that when running with Node v14 older versions of pg hang while connecting. To work with Node v14 pg must be updated to v8.0.3 or later.

[codecov-io]

Codecov Report

Merging #10 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #10   +/-   ##
=======================================
  Coverage   92.45%   92.45%           
=======================================
  Files           1        1           
  Lines          53       53           
  Branches        6        6           
=======================================
  Hits           49       49           
  Misses          4        4           

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