Update patch version for release - new version is 1.3.8-dev.

R=christofferqa@google.com

Change-Id: Ic908393c849317c329325872404676b4e97b58fa
diff --git a/src/main/java/com/android/tools/r8/Version.java b/src/main/java/com/android/tools/r8/Version.java
index b7fc6b3..0990f79 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 = "1.3.7-dev";
+  public static final String LABEL = "1.3.8-dev";
 
   private Version() {
   }