Issue #345: update to CS 8.37

Author: muhlba91

README.md

@@ -21,6 +21,7 @@ Compatibility matrix from checkstyle team:
 
 Checkstyle Plugin|Sonar min|Sonar max|Checkstyle|Jdk
 -----------------|---------|---------|----------|---
+8.37|7.9  |7.9+|8.37|1.8
 8.35|7.9  |7.9+|8.35|1.8
 4.34|7.9  |7.9+|8.34|1.8
 4.33|7.9  |7.9+|8.33|1.8

pom.xml

@@ -4,7 +4,7 @@
 
   <groupId>com.github.checkstyle</groupId>
   <artifactId>checkstyle-sonar-plugin</artifactId>
-  <version>8.36-SNAPSHOT</version>
+  <version>8.37-SNAPSHOT</version>
   <packaging>sonar-plugin</packaging>
 
   <name>Checkstyle SonarQube Plugin</name>
@@ -93,7 +93,7 @@
   </ciManagement>
 
   <properties>
-    <checkstyle.version>8.36.1</checkstyle.version>
+    <checkstyle.version>8.37</checkstyle.version>
     <sonar.version>7.9</sonar.version>
     <sonar-java.version>6.0.0.20538</sonar-java.version>
     <maven.checkstyle.plugin.version>3.1.1</maven.checkstyle.plugin.version>

src/test/java/org/sonar/plugins/checkstyle/CheckstyleRulesDefinitionTest.java

@@ -80,7 +80,7 @@ public void test() {
         // such number should not change during checkstyle version upgrade
         assertThat(duplicatedRuleWithTemplate).hasSize(174);
         // all new Rules should fall in this group
-        assertThat(rulesWithDuplicateTemplate).hasSize(5);
+        assertThat(rulesWithDuplicateTemplate).hasSize(6);
 
         for (RulesDefinition.Rule rule : rules) {
             assertThat(rule.key()).isNotNull();

wercker.yml

@@ -2,13 +2,6 @@ box: maven:3.6.3-jdk-11
 
 build:
   steps:
-  - script:
-        name: install metadata-gen in local repo
-        code: |
-          git clone https://github.com/checkstyle/metadata-gen.git
-          cd metadata-gen
-          mvn install
-          cd ../
   - script:
       name: setup maven local repo
       code: |