Update Copyright year

Author: augustoproiete

sample/SampleAddIn/Properties/AssemblyInfo.cs

@@ -15,7 +15,7 @@
 
 [assembly: AssemblyCompany("caioproiete.net")]
 [assembly: AssemblyProduct("Serilog.Enrichers.ExcelDna")]
-[assembly: AssemblyCopyright("Copyright © 2018-2019 Caio Proiete & Contributors")]
+[assembly: AssemblyCopyright("Copyright 2018-2020 Caio Proiete & Contributors")]
 [assembly: AssemblyTrademark("")]
 [assembly: AssemblyCulture("")]
 

src/Serilog.Enrichers.ExcelDna/Properties/AssemblyInfo.cs

@@ -15,7 +15,7 @@
 
 [assembly: AssemblyCompany("caioproiete.net")]
 [assembly: AssemblyProduct("Serilog.Enrichers.ExcelDna")]
-[assembly: AssemblyCopyright("Copyright © 2018-2019 Caio Proiete & Contributors")]
+[assembly: AssemblyCopyright("Copyright 2018-2020 Caio Proiete & Contributors")]
 [assembly: AssemblyTrademark("")]
 [assembly: AssemblyCulture("")]
 

src/Serilog.Enrichers.ExcelDna/Serilog.Enrichers.ExcelDna.nuspec

@@ -15,7 +15,7 @@
     <description>A Serilog Enricher with properties from Excel-DNA</description>
     <language>en-US</language>
     <tags>serilog enricher exceldna excel-dna xll xllpath</tags>
-    <copyright>Copyright (c) 2018-2019 Caio Proiete &amp; Contributors - Provided under the Apache License, Version 2.0</copyright>
+    <copyright>Copyright (c) 2018-2020 Caio Proiete &amp; Contributors - Provided under the Apache License, Version 2.0</copyright>
     <dependencies>
       <group targetFramework=".NETFramework4.5">
         <dependency id="Serilog" version="2.5.0" exclude="Build,Analyzers" />