index.d.ts function signatures are incorrect

[dvg-p4]

I did:

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• Give my issue a descriptive and concise title
• [N/A] Create a minimal working example on JsFiddle or Codepen
  (or gave a link to a demo on the Selectize docs)
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  like below

[replace me with a short description of issue]

Steps to reproduce:

1. Make a typescript project that uses selectize
2. Write e.g. selectize.clearOptions(true) anywhere

Expected result:

This will work

Actual result:

error TS2554: Expected 0 arguments, but got 1.

145       selectize.clearOptions(true);
                                 ~~~~

Cause:

The signature specified in index.d.ts does not match the actual function signature. This seems to be true for a number of functions.

[github-actions]

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