Bump version to 4.0.0

Author: mattjohnsonpint

src/TimeZoneNames/TimeZoneNames.csproj

@@ -11,7 +11,7 @@
     <IncludeSource>True</IncludeSource>
     <IncludeSymbols>True</IncludeSymbols>
     <SymbolPackageFormat>snupkg</SymbolPackageFormat>
-    <Version>3.4.0</Version>
+    <Version>4.0.0</Version>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)' == 'Release'">