Set GDB version number to 8.3.1.

gdb/ChangeLog:

	* version.in: Set GDB version number to 8.3.1.
diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 765e2c9..961a2e2 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,7 @@
+2019-09-20  Joel Brobecker  <brobecker@adacore.com>
+
+	* version.in: Set GDB version number to 8.3.1.
+
 2019-08-19  Tom Tromey  <tom@tromey.com>
 
 	PR gdb/25009
diff --git a/gdb/version.in b/gdb/version.in
index 78ca888..56b6be4 100644
--- a/gdb/version.in
+++ b/gdb/version.in
@@ -1 +1 @@
-8.3.0.DATE-git
+8.3.1