add support for write authorization.
Release 0.2.5
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API enhancements to support read/write authorization for GATT accesses.

Enhancements
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* Add support for authorization, whereby the user application can receive a
  callback to authorize a read or a write on a characteristic's value
  attribute before GATT commits the transaction.

Bugfixes
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Compatibility
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This release is backward compatible with 0.2.3.