Doesn't convert cups greater than 100

[jacobScottAllen]

PR Checklist

• [x] I have read the Contributing Guidelines
• [x] New functionality (or bug fix) is appropriately tested
• [x] PR includes closes #{issue number} if appropriate

  Bot does not convert cup measurements over 100. I have also included tests for this.

  Relevant link(s):

  Closes #82

[nalinbhardwaj]

LGTM, thanks @jacobScottAllen