Update version after branching. Now working on version 1.3.

R=ricow@google.com

Change-Id: I4e4019283209f3af4d7eebc729c6a9fd07cf91c9
diff --git a/src/main/java/com/android/tools/r8/Version.java b/src/main/java/com/android/tools/r8/Version.java
index c965c46..b775fd3 100644
--- a/src/main/java/com/android/tools/r8/Version.java
+++ b/src/main/java/com/android/tools/r8/Version.java
@@ -11,7 +11,7 @@
 
   // This field is accessed from release scripts using simple pattern matching.
   // Therefore, changing this field could break our release scripts.
-  public static final String LABEL = "1.2.24-dev";
+  public static final String LABEL = "1.3.0-dev";
 
   private Version() {
   }