Update copyright header

Author: pavel-alay

itext.tests/itext.cleanup.tests/Properties/AssemblyInfo.cs

@@ -7,7 +7,7 @@
 [assembly: AssemblyConfiguration("")]
 [assembly: AssemblyCompany("iText Group NV")]
 [assembly: AssemblyProduct("iText")]
-[assembly: AssemblyCopyright("Copyright (c) 1998-2017 iText Group NV")]
+[assembly: AssemblyCopyright("Copyright (c) 1998-2018 iText Group NV")]
 [assembly: AssemblyTrademark("")]
 [assembly: AssemblyCulture("")]
 

itext/itext.cleanup/Properties/AssemblyInfo.cs

@@ -7,7 +7,7 @@
 [assembly: AssemblyConfiguration("")]
 [assembly: AssemblyCompany("iText Group NV")]
 [assembly: AssemblyProduct("iText")]
-[assembly: AssemblyCopyright("Copyright (c) 1998-2017 iText Group NV")]
+[assembly: AssemblyCopyright("Copyright (c) 1998-2018 iText Group NV")]
 [assembly: AssemblyTrademark("")]
 [assembly: AssemblyCulture("")]
 [assembly: InternalsVisibleTo("itext.cleanup.tests,PublicKey=0024000004800000940000000602000000240000525" +

pdfSweep.nuspec

@@ -13,7 +13,7 @@
     <description>pdfSweep is an iText 7 add-on that allows you to permanently remove or black out sensitive data from your PDF documents.</description>
     <summary></summary>
     <releaseNotes>http://itextpdf.com/itext7release</releaseNotes>
-    <copyright>Copyright (c) 1998-2017 iText Group NV</copyright>
+    <copyright>Copyright (c) 1998-2018 iText Group NV</copyright>
     <language>en-US</language>
     <tags>itext itext7 itextsharp c# .net csharp pdf cleanup pdfsweep</tags>
 	<dependencies>