chore: more strict license header check via checkstyle (#81)

Author: adangel

src/main/resources/net/sourceforge/pmd/pmd-checkstyle-config.xml

@@ -307,7 +307,7 @@
   </module>
   <module name="RegexpHeader">
     <property name="severity" value="error"/>
-    <property name="header" value="^\/\*\*?[ ]*$\n^[ ]+\*[ ]+BSD-style license; for more info see http:\/\/pmd.sourceforge.net/license.html[ ]*\n[ ]+\*\/[ ]*$"/>
+    <property name="header" value="^\/\*$\n^ \* BSD-style license; for more info see http:\/\/pmd.sourceforge.net/license.html$\n^ \*\/$"/>
     <property name="fileExtensions" value="java,less,kt"/>
   </module>
   <module name="RegexpHeader">