colornames: fix copyright year.

These files were added in 2015:
https://go-review.googlesource.com/#/c/13181/

Presumably they were copy/pasted from something written in 2011.

Change-Id: I3defb4e02d03beb835e8a16c89bcae44c292e914
Reviewed-on: https://go-review.googlesource.com/14487
Reviewed-by: Brad Fitzpatrick <[email protected]>

 colornames/colornames.go      | 2 +-
 colornames/colornames_test.go | 2 +-
 colornames/gen.go             | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/colornames/colornames.go b/colornames/colornames.go
index e952be9..fa94d42 100644
--- a/colornames/colornames.go
+++ b/colornames/colornames.go
@@ -1,4 +1,4 @@
-// Copyright 2011 The Go Authors. All rights reserved.
+// Copyright 2015 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
diff --git a/colornames/colornames_test.go b/colornames/colornames_test.go
index d6d0324..5251bb8 100644
--- a/colornames/colornames_test.go
+++ b/colornames/colornames_test.go
@@ -1,4 +1,4 @@
-// Copyright 2011 The Go Authors. All rights reserved.
+// Copyright 2015 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
diff --git a/colornames/gen.go b/colornames/gen.go
index 035825c..c03404c 100644
--- a/colornames/gen.go
+++ b/colornames/gen.go
@@ -1,4 +1,4 @@
-// Copyright 2011 The Go Authors. All rights reserved.
+// Copyright 2015 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.