Update README.md

README.md

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 ## v4.0 Changes
-Removed `NonGenericEnums`, `NonGenericFlagEnums`, `UnsafeEnums`, and `UnsafeFlagEnums` classes which were deprecated in v3.0 and also removed all other deprecated methods in an effort to slim the library size down.
+Removed `NonGenericEnums`, `NonGenericFlagEnums`, `UnsafeEnums`, and `UnsafeFlagEnums` classes which were deprecated in v3.0 and also removed all other deprecated methods in an effort to slim the library size down. It is recommended if upgrading from 2.x and below to update to 3.x first and follow the warnings to migrate any code that's using deprecated methods and classes. Also, a dependency on the `System.Runtime.CompilerServices.Unsafe` was added for the .NET 4.5 target in order to remove a build dependency on Fody.
 
 ## v3.0 Changes
 One of the major changes for v3.0 is the deprecation of the `NonGenericEnums`, `NonGenericFlagEnums`, `UnsafeEnums`, and `UnsafeFlagEnums` classes whose methods have been added to the `Enums` and `FlagEnums` classes to better match `System.Enum` and provide better discoverability. To help you migrate your code to using the new methods I have created the C# roslyn analyzer [`Enums.NET.Analyzer`](https://www.nuget.org/packages/Enums.NET.Analyzer/) which provides a code fix to migrate your usages of the non-generic and unsafe methods to the new methods.