Update dependency graphql-codegen-typescript-template to v0.15.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
graphql-codegen-typescript-template	devDependencies	minor	0.12.6 -> 0.15.0

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[codecov]

Codecov Report

Merging #45 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #45   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           6      6           
  Lines          49     49           
=====================================
  Hits           49     49

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