v2.1.1 fixes two minor issues

* OpenAPI spec generation now sets a string type for enums
* a printStackTrace() call has been changed to use a java.util logger

v2.1.0 fixes some compatibility issues

* underscores are allowed in API names in very old versions of Endpoints
  v1, so we allow them without adding them to the documentation.
* required parameters now have null checking added to them.

v2.0.14 includes minor fixes and features

* re-add canonical name to discovery generation
* add description for enum constants used in parameters
* add retry logic for getting token info
* don't generate web accessible discovery for APIs that have
  discoverable set to false

v2.0.13 fixes list path parameter deserialization

v2.0.12 adds minor improvements and bug fixes

* discovery parameterOrder more closely matches original behavior
* discovery now has enum description support
* schema properties can be documented via @ApiResourceProperty
* API Explorer now uses the new Google icon
* null exception messages no longer cause a server error

v2.0.11 updates dependency versions

Most notably, the API client version has been changed to 1.23.0. This
is due to the fact that client libraries now generate with 1.23.0 as a
base, these clients are backwards incompatible.

v2.0.10 fixes some minor bugs

* add support for rejecting requests for methods annotated
  AuthLevel.REQUIRED before it reaches backend code
* when JWT and API key requirements are configured, require both,
  rather than either
* add ServiceException.withLogLevel for setting a custom log level
  for exceptions

v2.0.8 includes minor bug fixes

* parameterOrder is now set if query parameters exist, which should
  fix unstable parameter ordering in client libraries
* App Engine SDK version is bumped to 1.9.56
* OpenAPI spec generation uses the new Google extensions for auth

v2.0.8 adds rate limiting annotations and bug fixes

* Rate limiting annotations ApiLimitMetric and ApiMetricCost. These
  are provide config only. Implementation will be provided by the
  endpoints-management libraries.
* Unsupported HTTP methods will now fail more gracefully, rather than
  displaying a stacktrace to the caller.
* proxy.html for the Google JavaScript API client should now load
  slightly faster, due to not having to substitute a base path.

bump version to 2.0.7

* Bug fix for hostname and base path reversal for command line
  introduced in 2.0.6
* Transformed types are now treated correctly when used in array types