Update Typescript definition to match with Final-Form

[Lleios]

I added the type variable "InitialFormValues" like in Final-Form definition

[codesandbox-ci]

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[codecov]

Codecov Report

Merging #806 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #806   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           17        17           
  Lines          253       253           
  Branches        59        59           
=========================================
  Hits           253       253           

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[erikras]

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