Upgrade to Checkstyle 8.29

Closes gh-171

Author: snicoll

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>8.25</checkstyle.version>
+		<checkstyle.version>8.29</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/java/io/spring/javaformat/checkstyle/filter/CheckFilter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2019 the original author or authors.
+ * Copyright 2017-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -44,7 +44,6 @@ public class CheckFilter extends AbstractCheck {
 	@Override
 	public void finishLocalSetup() {
 		DefaultContext context = new DefaultContext();
-		context.add("classLoader", getClassLoader());
 		context.add("severity", getSeverity());
 		context.add("tabWidth", String.valueOf(getTabWidth()));
 		this.childContext = context;