Move 2.0 release line to RC

Author: bitwiseman

pom.xml

@@ -3,7 +3,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.kohsuke</groupId>
   <artifactId>github-api</artifactId>
-  <version>2.0-alpha-4-SNAPSHOT</version>
+  <version>2.0-rc.1-SNAPSHOT</version>
   <name>GitHub API for Java</name>
   <description>GitHub API for Java</description>
   <url>https://hub4j.github.io/github-api/</url>