Rename our allwpilib (which is now 2020) to not have 2019 in the name

Change-Id: I3c07f85ed32ab8b97db765a9b43f2a6ce7da964a
diff --git a/wpilibj/src/generate/WPILibVersion.java.in b/wpilibj/src/generate/WPILibVersion.java.in
new file mode 100644
index 0000000..cc5e6b0
--- /dev/null
+++ b/wpilibj/src/generate/WPILibVersion.java.in
@@ -0,0 +1,10 @@
+package edu.wpi.first.wpilibj.util;
+
+/*
+ * Autogenerated file! Do not manually edit this file. This version is regenerated
+ * any time the publish task is run, or when this file is deleted.
+ */
+
+public final class WPILibVersion {
+  public static final String Version = "${wpilib_version}";
+}