Set the release version to 0.3.0

Also, update the readme references to 0.3.0.

Author: dmitry-timofeev

exonum-light-client/README.md

@@ -37,12 +37,12 @@ If you are using Maven, add this to your _pom.xml_ file
 <dependency>
   <groupId>com.exonum.client</groupId>
   <artifactId>exonum-light-client</artifactId>
-  <version>0.2.0</version>
+  <version>0.3.0</version>
 </dependency>
 ```
 If you are using Gradle, add this to your dependencies
 ```Groovy
-compile 'com.exonum.client:exonum-light-client:0.2.0'
+compile 'com.exonum.client:exonum-light-client:0.3.0'
 ```
 
 ## Examples
@@ -138,4 +138,4 @@ Apache 2.0 - see [LICENSE](../LICENSE) for more information.
 [protobuf]: https://developers.google.com/protocol-buffers/docs/proto3
 [standard-serializers]: https://exonum.com/doc/api/java-binding/0.7.0/com/exonum/binding/common/serialization/StandardSerializers.html
 [send-tx-it]: ./src/test/java/com/exonum/client/ExonumHttpClientIntegrationTest.java
-[exonum-client]: https://exonum.com/doc/api/java-light-client/0.2.0/com/exonum/client/ExonumClient.html
+[exonum-client]: https://exonum.com/doc/api/java-light-client/0.3.0/com/exonum/client/ExonumClient.html

exonum-light-client/pom.xml

@@ -4,7 +4,7 @@
 
   <groupId>com.exonum.client</groupId>
   <artifactId>exonum-light-client</artifactId>
-  <version>0.3.0-SNAPSHOT</version>
+  <version>0.3.0</version>
   <packaging>jar</packaging>
 
   <name>Exonum Java Light Client</name>