Fix version numbers in readmes (#157)

Author: jnyrup

README.md

@@ -13,7 +13,7 @@ TimeZoneConverter is a lightweight library to convert quickly between IANA, Wind
 
 ## Compatibility
 
-As of version 9.0.0, TimeZoneConverter works with all of the following:
+As of version 7.0.0, TimeZoneConverter works with all of the following:
 
 - .NET 6, .NET 8, .NET 9
 - .NET Core 2.0 or greater

src/TimeZoneConverter.Posix/README.md

@@ -15,9 +15,9 @@ Note that `TimeZoneConverter.Posix` is dependendent on both [`TimeZoneConverter`
 
 ## Compatibility
 
-As of version 4.0.0, TimeZoneConverter.Posix works with all of the following:
+As of version 5.0.0, TimeZoneConverter.Posix works with all of the following:
 
-- .NET 5 or greater
+- .NET 6 or greater
 - .NET Core 2.0 or greater
 - .NET Framework 4.6.2 and greater