Issue #170: update to Checkstyle 8.26

Author: Calixte

net.sf.eclipsecs.checkstyle/.classpath

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
-	<classpathentry exported="true" kind="lib" path="checkstyle-8.25-all.jar" sourcepath="checkstyle-checkstyle-8.25.zip"/>
+	<classpathentry exported="true" kind="lib" path="checkstyle-8.26-all.jar" sourcepath="checkstyle-checkstyle-8.26.zip"/>
 	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8">
 		<attributes>
 			<attribute name="maven.pomderived" value="true"/>

net.sf.eclipsecs.checkstyle/META-INF/MANIFEST.MF

@@ -46,5 +46,5 @@ Export-Package: .,
  com.puppycrawl.tools.checkstyle.utils,
  org.apache.commons.beanutils;version="8.25.0"
 Bundle-ClassPath: .,
- checkstyle-8.25-all.jar
+ checkstyle-8.26-all.jar
 Automatic-Module-Name: net.sf.eclipsecs.checkstyle

net.sf.eclipsecs.checkstyle/build.properties

@@ -1,6 +1,6 @@
 bin.includes = META-INF/,\
                .,\
                license/,\
-               checkstyle-8.25-all.jar
+               checkstyle-8.26-all.jar
 jars.compile.order = .
 source.. = metadata/