adding period to options

[FionaLovett]

I require the ability to create periodic tokens, so have added the period parameter to tokenCreate.

[codecov[bot]]

Codecov Report

Merging #141 into master will not change coverage by %. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #141   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines          139       139           
  Branches        34        34           
=========================================
  Hits           139       139           

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[aviadhahami]

closing due to staleness; please reopen if desired