release(2020-05-15): bump package versions

[prmathur-microsoft]

Checklist

• I have read the [contribution guidelines] (https://github.com/Azure/azure-iot-sdk-java/blob/master/.github/CONTRIBUTING.md).
• I added or modified the existing tests to cover the change (we do not allow our test coverage to go down).
• If this is a modification that impacts the behavior of a public API
  • I edited the corresponding document in the devdoc folder and added or modified requirements.
• I submitted this PR against the correct branch:
  • This pull-request is submitted against the master branch.

Adding release notes for review :

Java IotHub Service Client (com.microsoft.azure.sdk.iot:iot-service-client:1.22.0)

• Add proxy support for registry manager (feat(iot-service): Add proxy support for registry manager #768)
• Add proxy support for service client operations (feat(iot-service): Add proxy support for service client operations #773)

Bug Fixes

• Fix issue where amqp layer didn't recognize an ack to a subscription message that it sent (fix(iot-dev): Fix issue where amqp layer didn't recognize an ack to a subscription message that it sent #778)

Java IotHub Device Client (com.microsoft.azure.sdk.iot:iot-device-client:1.22.0)

• Support Twin Array properties (feat(device;service): Support Twin Array properties #770)

Bug Fixes

• Fix issue where amqp layer didn't recognize an ack to a subscription message that it sent (fix(iot-dev): Fix issue where amqp layer didn't recognize an ack to a subscription message that it sent #778)
• Fix issue where MQTT didn't url encode application properties correctly (fix(iot-dev): Fix issue where MQTT didn't url encode application properties correctly #775)
• Fix bug in amqpws, raise max message size from 1 kb to 16 kb (fix(iot-dev): Fix bug in amqpws, raise max message size from 1 kb to 16 kb #767)

Java SDK Dependency (com.microsoft.azure.sdk.iot:iot-deps:0.9.4)

• Update proton-j extension to 1.2.3

https://search.maven.org/artifact/com.microsoft.azure.sdk.iot/iot-device-client/1.22.0/jar
https://search.maven.org/artifact/com.microsoft.azure.sdk.iot/iot-service-client/1.22.0/jar
https://search.maven.org/artifact/com.microsoft.azure.sdk.iot/iot-deps/0.9.4/jar

[timtay-microsoft]

Service client side also got twin array support for sending desired properties, so you can add that to the release notes

[timtay-microsoft]

Otherwise, looks good

[prmathur-microsoft]

/azp run

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