Take version from package.json

[eddiemoore]

Instead of a hard coded version number, use the version from the package.json file
Closes #51

[codecov]

Codecov Report

Merging #52 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #52   +/-   ##
=======================================
  Coverage   95.59%   95.59%           
=======================================
  Files          17       17           
  Lines         227      227           
  Branches       43       43           
=======================================
  Hits          217      217           
  Misses         10       10

Impacted Files	Coverage Δ
lib/codecov.js	92.37% <100%> (ø)	✅

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