Version bump to 0.6.4

Aside from the version number, nothing has changed between 0.6.3.1 and
0.6.4 - we're doing this as Vortex's semver module does not support 4
version components (given that we aim to automatically update the merger
this would make our lives easier)

Author: IDCs

WitcherScriptMerger/Properties/AssemblyInfo.cs

@@ -10,7 +10,7 @@
 [assembly: AssemblyConfiguration("")]
 [assembly: AssemblyCompany("")]
 [assembly: AssemblyProduct("WitcherScriptMerger")]
-[assembly: AssemblyCopyright("Copyright ©  2015")]
+[assembly: AssemblyCopyright("Copyright ©  2020")]
 [assembly: AssemblyTrademark("")]
 [assembly: AssemblyCulture("")]
 
@@ -32,5 +32,5 @@
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("0.6.3.1")]
-[assembly: AssemblyFileVersion("0.6.3.1")]
+[assembly: AssemblyVersion("0.6.4")]
+[assembly: AssemblyFileVersion("0.6.4")]