Update copyright year

Author: reisenberger

src/GlobalAssemblyInfo.cs

@@ -3,7 +3,7 @@
 [assembly: AssemblyProduct("Polly.Caching.Memory")]
 [assembly: AssemblyCompany("App vNext")]
 [assembly: AssemblyDescription("Polly.Caching.Memory is a MemoryCache plug-in for the Polly CachePolicy.  Polly is a library that allows developers to express resilience and transient fault handling policies such as Retry, Circuit Breaker, Timeout, Bulkhead Isolation, and Fallback in a fluent and thread-safe manner.")]
-[assembly: AssemblyCopyright("Copyright (c) 2018, App vNext")]
+[assembly: AssemblyCopyright("Copyright (c) 2019, App vNext")]
 
 #if DEBUG
 [assembly: AssemblyConfiguration("Debug")]

src/Polly.Caching.Memory.nuspec

@@ -11,7 +11,7 @@
     <iconUrl>https://raw.github.com/App-vNext/Polly/master/Polly.png</iconUrl>
     <projectUrl>https://github.com/App-vNext/Polly.Caching.MemoryCache</projectUrl>
     <tags>Polly Cache Caching Cache-aside</tags>
-    <copyright>Copyright © 2018, App vNext</copyright>
+    <copyright>Copyright © 2019, App vNext</copyright>
     <releaseNotes>
      2.0.1
      ---------------------