Update patch version for release - new version is 1.6.26-dev

Change-Id: If891b44b652fcf1f9598095a04048962edfb216e
diff --git a/src/main/java/com/android/tools/r8/Version.java b/src/main/java/com/android/tools/r8/Version.java
index f6d44b3..8186c6e 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 = "1.6.25-dev";
+  public static final String LABEL = "1.6.26-dev";
 
   private Version() {
   }