feat: update react-docgen-typescript to the latest version

[nekitk]

Updated react-docgen-typescript dependency to include following changes:

• feat: extract default props from destructuring styleguidist/react-docgen-typescript#200
  Default values for stateless components can now be generated from props destructuring
• feat: extract literal values from enums styleguidist/react-docgen-typescript#201
  Passing new parser option (shouldExtractLiteralValuesFromEnum) which allows to parse TypeScript enums and string unions to docgen enum of their values:
  If false (like before): type: { name: "\"blue\" | \"green\"" } or type: { name: "ColorEnum" }
  If true: type: { name: "enum", value: [ { value: "\"blue\"" }, { value: "\"green\""} ] }

[strothj]

Published as 3.2.0. Thanks again!