Update CHANGELOG and README

Author: gaeljw

CHANGELOG.md

@@ -13,6 +13,8 @@ See also the [CHANGELOG](https://github.com/cucumber/cucumber-jvm/blob/master/CH
 
 ### Changed
 
+- [Core] Update `cucumber-core` dependency to [6.4.0](https://github.com/cucumber/cucumber-jvm/blob/main/CHANGELOG.md)
+
 ### Deprecated
 
 ### Removed

README.md

@@ -17,7 +17,7 @@ The minor version might differ because Cucumber Scala may add Scala-related feat
 
 | Cucumber Scala version | Cucumber version | Scala versions   |
 |------------------------|------------------|------------------|
-| 6.3.0                  | 6.3.0            | 2.11, 2.12, 2.13 |
+| 6.4.0                  | 6.4.0            | 2.11, 2.12, 2.13 |
 | 5.7.0                  | 5.7.0            | 2.11, 2.12, 2.13 |
 | 4.7.1                  | 4.7.1            | 2.11, 2.12, 2.13 |