Don't use v in version

Only causes trouble.
From a quick look in our tools, only the maven bundle creation does anything with the v (removes it :-))

Change-Id: I58d7acc6a39f97fdac25eb2890335827037bfefb
diff --git a/src/main/java/com/android/tools/r8/Version.java b/src/main/java/com/android/tools/r8/Version.java
index d7f1fa8..0712db2 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 = "v1.2.15-dev";
+  public static final String LABEL = "1.2.15-dev";
 
   private Version() {
   }
diff --git a/tools/create_maven_release.py b/tools/create_maven_release.py
index 47bf7d2..0a7f122 100755
--- a/tools/create_maven_release.py
+++ b/tools/create_maven_release.py
@@ -74,7 +74,7 @@
   with open(version_file, 'r') as file:
     for line in file:
       if 'final String LABEL ' in line:
-        result = line[line.find('"v') + 2:]
+        result = line[line.find('"') + 1:]
         result = result[:result.find('"')]
         return result
   raise Exception('Unable to determine version.')