Bump version to 0.2.1
Bump version to 0.2.1

0.2.1
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* Generators
  - model generator now uses type string for model ids for improved
    store compatibility (particularly cloudant/couchdb)

IBM-Swift/generator-swiftserver,IBM-Swift/generator-swiftserver,IBM-Swift/generator-swiftserver,IBM-Swift/generator-swiftserver