Release 0.12.4 of the Amazon Kinesis Producer Library

=== 0.12.4

==== Java

* Upgraded dependency on aws-java-sdk-core to 1.11.128, and removed version range.
  * [PR #84](#84)
  * [PR #106](#106)
* Use an explicit lock file to manage access to the native KPL binaries.
  * [Issue #91](#91)
  * [PR #92](#92)
* Log reader threads should be shut down when the native process exits.
  * [Issue #93](#93)
  * [PR #94](#94)

==== C++ Core

* Add support for using a thread pool, instead of a thread per request.
  The thread pool model guarantees a fixed number of threads, but have issue catching up if the KPL is overloaded.
  * [PR #100](#100)
* Add log messages, and statistics about sending data to Kinesis.
  * Added flush statistics that record the count of events that trigger flushes of data destined for Kinesis
  * Added a log message that indicates the average time it takes for a PutRecords request to be completed.

      This time is recorded from the when the request is enqueued to when it is completed.
  * Log a warning if the average request time rises above five times the configured flush interval.

      If you see this warning normally it indicates that the KPL is having issues keeping up. The most likely
      cause is to many requests being generated, and you should investigate the flush triggers to determine why flushes
      are being triggered.
  * [PR #102](#102)

README.md

@@ -8,6 +8,37 @@ For detailed information and installation instructions, see the article [Develop
 
 ## Release Notes
 
+### 0.12.4
+
+#### Java
+
+* Upgraded dependency on aws-java-sdk-core to 1.11.128, and removed version range.
+  * [PR #84](https://github.com/awslabs/amazon-kinesis-producer/pull/84)
+  * [PR #106](https://github.com/awslabs/amazon-kinesis-producer/pull/106)
+* Use an explicit lock file to manage access to the native KPL binaries.
+  * [Issue #91](https://github.com/awslabs/amazon-kinesis-producer/issues/91)
+  * [PR #92](https://github.com/awslabs/amazon-kinesis-producer/pull/92)
+* Log reader threads should be shut down when the native process exits.
+  * [Issue #93](https://github.com/awslabs/amazon-kinesis-producer/issues/93)
+  * [PR #94](https://github.com/awslabs/amazon-kinesis-producer/pull/94)
+
+#### C++ Core
+
+* Add support for using a thread pool, instead of a thread per request.
+  The thread pool model guarantees a fixed number of threads, but have issue catching up if the KPL is overloaded.
+  * [PR #100](https://github.com/awslabs/amazon-kinesis-producer/pull/100)
+* Add log messages, and statistics about sending data to Kinesis.
+  * Added flush statistics that record the count of events that trigger flushes of data destined for Kinesis
+  * Added a log message that indicates the average time it takes for a PutRecords request to be completed.
+
+      This time is recorded from the when the request is enqueued to when it is completed.
+  * Log a warning if the average request time rises above five times the configured flush interval.
+
+      If you see this warning normally it indicates that the KPL is having issues keeping up. The most likely
+      cause is to many requests being generated, and you should investigate the flush triggers to determine why flushes
+      are being triggered.
+  * [PR #102](https://github.com/awslabs/amazon-kinesis-producer/pull/102)
+
 ### 0.12.3
 
 #### Java