Fix accidental omission of R revision number in version.

By: md_5 <git@md-5.net>

paper-api/pom.xml

@@ -11,7 +11,7 @@
 
     <groupId>org.bukkit</groupId>
     <artifactId>bukkit</artifactId>
-    <version>1.9-SNAPSHOT</version>
+    <version>1.9-R0.1-SNAPSHOT</version>
     <packaging>jar</packaging>
 
     <name>Bukkit</name>