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-Updating from 3.x to 4.x
-========================
-
-In middleclass 4.0 there is no global `Object` class any more. Classes created with `class(<name>)` don't have a superclass any more.
-If you need a global `Object` class, you must create it explicitly and then use it when creating new classes:
-
-```lua
-local Object = class('Object')
-
-...
-
-local MyClass = class('MyClass', Object)
-```
-
-If you are using a library which depends on the internal implementation of middleclass they might not work with middleclass 4.0. You might need to update those other libraries.
-
-Middleclass 4.0 comes with support for `__index` metamethod support. If your library manipulated the classes' `__instanceDict` internal attribute, you might do the same thing now using `__index` instead.
-
-Also note that the class method `:implements` has been removed.
-
-Updating from 2.x to 3.x
-========================
-
-Middleclass used to expose several global variables on the main scope. It does not do that anymore.
-
-`class` is now returned by `require 'middleclass'`, and it is not set globally. So you can do this:
-
-```lua
-local class = require 'middleclass'
-local MyClass = class('MyClass') -- works as before
-```
-
-`Object` is not a global variable any more. But you can get it from `class.Object`
-
-```lua
-local class = require 'middleclass'
-local Object = class.Object
-
-print(Object) -- prints 'class Object'
-```
-
-The public functions `instanceOf`, `subclassOf` and `includes` have been replaced by `Object.isInstanceOf`, `Object.static.isSubclassOf` and `Object.static.includes`.
-
-Prior to 3.x:
-
-```lua
-instanceOf(MyClass, obj)
-subclassOf(Object, aClass)
-includes(aMixin, aClass)
-```
-
-Since 3.x:
-
-```lua
-obj:isInstanceOf(MyClass)
-aClass:isSubclassOf(Object)
-aClass:includes(aMixin)
-```
-
-The 3.x code snippet will throw an error if `obj` is not an object, or if `aClass` is not a class (since they will not implement `isInstanceOf`, `isSubclassOf` or `includes`).
-If you are unsure of whether `obj` and `aClass` are an object or a class, you can use the methods in `Object`. They are prepared to work with random types, not just classes and instances:
-
-```lua
-Object.isInstanceOf(obj, MyClass)
-Object.isSubclassOf(aClass, Object)
-Object.includes(aClass, aMixin)
-```
-
-Notice that the parameter order is not the same now as it was in 2.x. Also note the change in naming: `isInstanceOf` instead of `instanceOf`, and `isSubclassOf` instead of `subclassOf`.