Migrate to new fusion-tokens api

[ganemone]

Fixes #60

[codecov]

Codecov Report

Merging #61 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #61   +/-   ##
=======================================
  Coverage   89.58%   89.58%           
=======================================
  Files           4        4           
  Lines          48       48           
  Branches        8       10    +2     
=======================================
  Hits           43       43           
  Misses          3        3           
  Partials        2        2

Impacted Files	Coverage Δ
src/jwt-server.js	95.12% <100%> (ø)	⬆️
src/tokens.js	100% <100%> (ø)	⬆️

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[ganemone]

!merge