MAGETWO-90356: Update copyright year

DianaRusin · DianaRusin · commit eeb78a0b9273 · 2018-05-02T14:47:18.000+03:00
diff --git a/COPYING.txt b/COPYING.txt
@@ -1,4 +1,4 @@
-Copyright © 2013-2018 Magento, Inc.
+Copyright © 2013-present Magento, Inc.
 
 Each Magento source file included in this distribution is licensed under OSL 3.0 or the Magento Enterprise Edition (MEE) license
 

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-Copyright © 2013-2018 Magento, Inc.`
	`1`	`+Copyright © 2013-present Magento, Inc.`
`2`	`2`
`3`	`3`	`Each Magento source file included in this distribution is licensed under OSL 3.0 or the Magento Enterprise Edition (MEE) license`
`4`	`4`