Add rat check to README and CONTRIBUTING (#109)

diff --git a/build.gradle b/build.gradle
index 6a3fe5b..abc82e3 100644
--- a/build.gradle
+++ b/build.gradle
@@ -40,7 +40,6 @@
 					'**/META-INF/services/*',
 					'out/**', '*.ipr', '**/*.iml', '*.iws', '.idea/**', // Intellij files
 					'.classpath', '.project', '.settings/**', 'bin/**', // Eclipse files
-					'CONTRIBUTING.adoc', 'README.adoc',
 		]
 	}
 }
diff --git a/buildSrc/build.gradle b/buildSrc/build.gradle
index effb2d5..e53d373 100644
--- a/buildSrc/build.gradle
+++ b/buildSrc/build.gradle
@@ -32,5 +32,5 @@
 	implementation libs.spring.javaformat.gradle.plugin
 	implementation libs.licenser
 	implementation libs.testlogger
-	implementation 'org.nosphere.apache:creadur-rat-gradle:0.8.0'
+	implementation libs.rat.gradle
 }
\ No newline at end of file
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 705d751..98a80ed 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -32,6 +32,7 @@
 licenser = "0.6.1"
 mockito = "4.9.0"
 testlogger = "3.2.0"
+rat-gradle = "0.8.0"
 
 [libraries]
 pulsar-client-shaded = { module = "org.apache.pulsar:pulsar-client", version.ref = "pulsar" }
@@ -56,6 +57,7 @@
 mockito-core = { module = "org.mockito:mockito-core", version.ref = "mockito" }
 mockito-inline = { module = "org.mockito:mockito-inline", version.ref = "mockito" }
 testlogger = { module = "com.adarshr:gradle-test-logger-plugin", version.ref = "testlogger"}
+rat-gradle = { module = "org.nosphere.apache:creadur-rat-gradle", version.ref = "rat-gradle"}
 
 [bundles]
 log4j = ["log4j-api", "log4j-core", "log4j-slf4j-impl", "slf4j-api"]