Use 0.9.0-rc2 as ejb.version in Light Client

Replace the temporary dependency on a snapshot version
with a released 0.9.0-rc2, which the next LC shall use.

Author: Ilya Bogdanov

exonum-light-client/pom.xml

@@ -61,8 +61,7 @@
 
   <properties>
     <!-- Project configuration -->
-    <!-- TODO: Rollback to 0.9.0-rc1 when it is released -->
-    <ejb.version>0.10.0-SNAPSHOT</ejb.version>
+    <ejb.version>0.9.0-rc2</ejb.version>
     <java.compiler.source>8</java.compiler.source>
     <java.compiler.target>8</java.compiler.target>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>