Update version to 4.0.0

Author: lsoares

README.md

@@ -16,7 +16,7 @@ the [library's latest version at Maven Central](https://search.maven.org/artifac
 Then, copy the declaration for your build tool. E.g.:
 
 ```kotlin
-implementation("com.luissoares:selenium-testing-library:4.0.0-beta")
+implementation("com.luissoares:selenium-testing-library:4.0.0")
 ```
 
 ---

lib/build.gradle.kts

@@ -29,7 +29,7 @@ java {
     withJavadocJar()
 }
 
-version = "4.0.0-beta"
+version = "4.0.0"
 group = "com.luissoares"
 
 publishing {