Support Checkstyle 8.25 and later

Closes gh-156

Author: wilkinsona

pom.xml

@@ -38,7 +38,7 @@
 		<ant-contrib.version>1.0b3</ant-contrib.version>
 		<asm.version>5.2</asm.version>
 		<assertj.version>3.8.0</assertj.version>
-		<checkstyle.version>8.22</checkstyle.version>
+		<checkstyle.version>8.25</checkstyle.version>
 		<gradle.version>3.4</gradle.version>
 		<groovy.version>2.4.7</groovy.version>
 		<maven-core.version>3.5.0</maven-core.version>

spring-javaformat/spring-javaformat-checkstyle/src/main/resources/io/spring/javaformat/checkstyle/spring-checkstyle.xml

@@ -132,9 +132,7 @@
 			<property name="scope" value="package"/>
 			<property name="authorFormat" value=".+\s.+"/>
 		</module>
-		<module name="com.puppycrawl.tools.checkstyle.checks.javadoc.JavadocMethodCheck">
-			<property name="allowMissingJavadoc" value="true" />
-		</module>
+		<module name="com.puppycrawl.tools.checkstyle.checks.javadoc.JavadocMethodCheck" />
 		<module name="com.puppycrawl.tools.checkstyle.checks.javadoc.JavadocVariableCheck">
 			<property name="scope" value="public"/>
 		</module>

src/checkstyle/checkstyle.xml

@@ -92,9 +92,7 @@
 			<property name="scope" value="package"/>
 			<property name="authorFormat" value=".+\s.+"/>
 		</module>
-		<module name="com.puppycrawl.tools.checkstyle.checks.javadoc.JavadocMethodCheck">
-			<property name="allowMissingJavadoc" value="true" />
-		</module>
+		<module name="com.puppycrawl.tools.checkstyle.checks.javadoc.JavadocMethodCheck" />
 		<module name="com.puppycrawl.tools.checkstyle.checks.javadoc.JavadocVariableCheck">
 			<property name="scope" value="public"/>
 		</module>