Version 3.1.20

Bug: 198416916
Change-Id: I8227f9a88af230be4aa3d146730c2ea9792932b5
diff --git a/src/main/java/com/android/tools/r8/Version.java b/src/main/java/com/android/tools/r8/Version.java
index 4a9cc4e..3e29f7e 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 = "3.1.19";
+  public static final String LABEL = "3.1.20";
 
   private Version() {
   }