Case fix

Author: ENikS

Package.nuspec

@@ -11,7 +11,7 @@
     <requireLicenseAcceptance>false</requireLicenseAcceptance>
     <description>Unity Container Library as single package</description>
     <releaseNotes>Entire Unity Library as single package.</releaseNotes>
-    <Copyright>Copyright © Unity Container Project 2018</Copyright>
+    <copyright>Copyright © Unity Container Project 2018</copyright>
     <tags>Unity Container unitycontainer Microsoft.Practices.Unity IoC</tags>
     <dependencies>
       <group targetFramework=".NETCoreApp2.0">