chore(package): update rollup to version 0.64.1

[pveyes]

Closes #66

[codecov]

Codecov Report

Merging #67 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #67   +/-   ##
=======================================
  Coverage   98.78%   98.78%           
=======================================
  Files           5        5           
  Lines         165      165           
  Branches       40       40           
=======================================
  Hits          163      163           
  Misses          2        2

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