Allow TestKit module publication [ECR-3120] (#990)

Allow TestKit module publication and update changelog.

Author: MakarovS

exonum-java-binding/CHANGELOG.md

@@ -16,13 +16,22 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ## [Unreleased]
 
 ### Added
+- A new `exonum-testkit` module that allows to emulate blockchain network and test transaction
+  execution in the synchronous environment (that is, without consensus algorithm and network
+  operation involved).
+  Main component of this module is `TestKit` which allows recreating behavior of a single full
+  node (a validator or an auditor) in an emulated Exonum blockchain network.
+  For more information and examples see [documentation][testkit-documentation].
+  (#819, #833, #859, #913, #989)
 - Verification of native library compatibility when it is first loaded, to detect
   possible mismatch between an installed exonum-java application and the version
   used in a service project. (#882)
 - `Block#isEmpty()`
 - `RawTransaction#fromMessage(TransactionMessage)`, which is mostly useful in tests,
   where you might have a message but need it as a `RawTransaction` in some assertions.
 
+[testkit-documentation]: https://exonum.com/doc/version/0.11/get-started/java-binding/#testing
+
 ### Changed
 - `BinaryTransactionMessage#toString` to include some fields in human-readable
   format instead of the whole message in binary form.

exonum-java-binding/testkit/pom.xml

@@ -90,15 +90,6 @@
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-source-plugin</artifactId>
       </plugin>
-
-      <!-- Skip the deployment of TestKit module as it is not yet ready, fix in ECR-3120 -->
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-deploy-plugin</artifactId>
-        <configuration>
-          <skip>true</skip>
-        </configuration>
-      </plugin>
     </plugins>
   </build>
 </project>