Version 4.0.40

Fix remaining nio, including FileChannel.

Change-Id: I1834b360143c3cc1bdaa0cd03640b54e2e7f8165
diff --git a/src/main/java/com/android/tools/r8/Version.java b/src/main/java/com/android/tools/r8/Version.java
index 04a8f3d..090de9d 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 = "4.0.39";
+  public static final String LABEL = "4.0.40";
 
   private Version() {
   }