Set version to 3.4.0-rc1

Change-Id: I0b8a7b95249140886424acec1f9a0fa3b0e95713

pom.xml

diff --git a/pom.xml b/pom.xml
index 26187a5..f613caa 100644
--- a/pom.xml
+++ b/pom.xml
@@ -18,7 +18,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.googlesource.gerrit.plugins.github</groupId>
   <artifactId>github-parent</artifactId>
-  <version>3.4.0-rc0</version>
+  <version>3.4.0-rc1</version>
   <name>Gerrit Code Review - GitHub integration</name>
   <url>http://www.gerritforge.com</url>
   <packaging>pom</packaging>