sdk/java: increment version to 2-rc2

Closes #3320

Author: Dan Croak <dan@statusok.com>
Date: Fri Apr 13 12:31:57 2018 -0700
upstream:2c4cdf9e8dcf9b3487d1bfc662ebcaa02f48be6b

Author: croaky

CHANGELOG.md

@@ -1,6 +1,6 @@
 # Sequence Java SDK changelog
 
-## 2-rc2 (????????)
+## 2-rc2 (20180413)
 
 * Changed `Action|ActionSum.tags` type from `Object` to `Map<String, Object>`.
 

pom.xml

@@ -5,7 +5,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.seq</groupId>
     <artifactId>sequence-sdk</artifactId>
-    <version>2-rc1</version>
+    <version>2-rc2</version>
     <packaging>jar</packaging>
 
     <name>${project.groupId}:${project.artifactId}</name>