[release-branch.go1.7] go1.7.3

Change-Id: I906070c84c0f40c4dd8af8b5894895127834ee00
Reviewed-on: https://go-review.googlesource.com/31438
Run-TryBot: Chris Broadfoot <cbro@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

VERSION

diff --git a/VERSION b/VERSION
index 16a40ba..816aead 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-go1.7.2
\ No newline at end of file
+go1.7.3
\ No newline at end of file