Minimum Chainwork / Graviton Hard Fork Activation timestamp added.

[jjgg22zh]

Added an additional graviton unix-timestamp for which the 2019 November 15th Hard Fork occurs.

Including the Minimum Chainwork Settings found in the Bitcoin-ABC codebase.

[codecov-io]

Codecov Report

Merging #127 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #127   +/-   ##
=======================================
  Coverage   55.55%   55.55%           
=======================================
  Files         109      109           
  Lines       27184    27184           
  Branches     4498     4498           
=======================================
  Hits        15102    15102           
  Misses      12082    12082

Impacted Files	Coverage Δ
lib/protocol/networks.js	100% <ø> (ø)	:arrow_up:

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