merge package template from Kronos-Tools/npm-package-template

[arlac77]

package.json

• chore(devDependencies): update rollup@^0.51.2 from template
• docs(package): remove keyword null

[codecov-io]

Codecov Report

Merging #93 into master will not change coverage.
The diff coverage is n/a.

@@         Coverage Diff          @@
##           master   #93   +/-   ##
====================================
  Coverage      92%   92%           
====================================
  Files           1     1           
  Lines          25    25           
====================================
  Hits           23    23           
  Misses          2     2

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[coveralls]

Coverage remained the same at 91.429% when pulling 44bb543 on template-sync-1 into 9c7a4df on master.