Move checkstyle config files.
diff --git a/pom.xml b/pom.xml
index 143e100..43f1812 100644
--- a/pom.xml
+++ b/pom.xml
@@ -168,10 +168,10 @@
             <id>validate</id>
             <phase>validate</phase>
             <configuration>
-              <configLocation>${top.dir}/src/main/config/checkstyle.xml</configLocation>
-              <suppressionsLocation>${top.dir}/src/main/config/checkstyle-suppressions.xml</suppressionsLocation>
+              <configLocation>${top.dir}/src/main/config/checkstyle/checker.xml</configLocation>
+              <suppressionsLocation>${top.dir}/src/main/config/checkstyle/suppressions.xml</suppressionsLocation>
               <consoleOutput>true</consoleOutput>
-              <headerLocation>${top.dir}/src/main/config/license-header.txt</headerLocation>
+              <headerLocation>${top.dir}/src/main/config/checkstyle/header.txt</headerLocation>
               <failOnViolation>true</failOnViolation>
               <includeTestSourceDirectory>true</includeTestSourceDirectory>
             </configuration>
diff --git a/src/main/config/checkstyle.xml b/src/main/config/checkstyle/checker.xml
similarity index 100%
rename from src/main/config/checkstyle.xml
rename to src/main/config/checkstyle/checker.xml
diff --git a/src/main/config/license-header.txt b/src/main/config/checkstyle/header.txt
similarity index 100%
rename from src/main/config/license-header.txt
rename to src/main/config/checkstyle/header.txt
diff --git a/src/main/config/checkstyle-suppressions.xml b/src/main/config/checkstyle/suppressions.xml
similarity index 100%
rename from src/main/config/checkstyle-suppressions.xml
rename to src/main/config/checkstyle/suppressions.xml