add changelog entry for predicate removal

CHANGELOG.md

@@ -4,6 +4,8 @@
 
 - drop support for Ruby < 2.5
 - drop support for Rails < 5.0
+- [#398][] - Predicate methods have been removed.
+  ([how to upgrade](#predicate-methods))
 - [#392][] - Integer parsing now defaults the base to 10.
   ([how to upgrade](#integer-parsing-base-now-10))
 - The `inputs` method now returns an `ActiveInteraction::Input` instead of a
@@ -27,6 +29,40 @@
 
 ## Upgrading
 
+### Predicate Methods
+
+We've removed the predicate methods that were automatically generated for each
+input. They would return true if an input was not `nil`.  They can be manually
+replaced with that same check.
+
+```ruby
+# v3.8
+class Example < ActiveInteraction::Base
+  string :first_name
+
+  validates :first_name,
+    presence: true,
+    if: :first_name?
+
+  def execute
+    # ...
+  end
+end
+
+# v4.0
+class Example < ActiveInteraction::Base
+  string :first_name
+
+  validates :first_name,
+    presence: true,
+    unless: 'first_name.nil?'
+
+  def execute
+    # ...
+  end
+end
+```
+
 ### Integer Parsing Base Now 10
 
 Integers are parsed using `Integer`. By default this meant that when
@@ -1056,14 +1092,6 @@ Example.run
   [#477]: https://github.com/AaronLasseigne/active_interaction/issues/477
   [#476]: https://github.com/AaronLasseigne/active_interaction/issues/476
   [#479]: https://github.com/AaronLasseigne/active_interaction/issues/479
-<<<<<<< HEAD
-<<<<<<< HEAD
   [#486]: https://github.com/AaronLasseigne/active_interaction/issues/486
-=======
-=======
-  [#392]: https://github.com/AaronLasseigne/active_interaction/issues/392
->>>>>>> dc8b989... default the integer base to 10
->>>>>>> b83ca8a (default the integer base to 10)
-=======
   [#392]: https://github.com/AaronLasseigne/active_interaction/issues/392
->>>>>>> 2594b86 (remove interface type support from the object and record filters)
+  [#398]: https://github.com/AaronLasseigne/active_interaction/issues/398