[maven-release-plugin] prepare for next development iteration

Author: kevinsawicki

github-core/pom.xml

@@ -4,7 +4,7 @@
     <parent>
         <groupId>com.github.github</groupId>
         <artifactId>github-maven-plugins-parent</artifactId>
-        <version>0.12</version>
+        <version>0.13-SNAPSHOT</version>
     </parent>
 
     <artifactId>github-maven-core</artifactId>

github-site-plugin/pom.xml

@@ -4,7 +4,7 @@
     <parent>
         <groupId>com.github.github</groupId>
         <artifactId>github-maven-plugins-parent</artifactId>
-        <version>0.12</version>
+        <version>0.13-SNAPSHOT</version>
     </parent>
 
     <artifactId>site-maven-plugin</artifactId>

pom.xml

@@ -4,7 +4,7 @@
 
     <groupId>com.github.github</groupId>
     <artifactId>github-maven-plugins-parent</artifactId>
-    <version>0.12</version>
+    <version>0.13-SNAPSHOT</version>
     <packaging>pom</packaging>
 
     <parent>