fix #68: check logging method even though they has no parameter

Author: KengoTODA

CHANGELOG.md

@@ -6,6 +6,7 @@ This changelog follows [Keep a Changelog v1.0.0](https://keepachangelog.com/en/1
 ### Fixed
 
 - False negative around logging method with `Marker` instances ([#105](https://github.com/KengoTODA/findbugs-slf4j/pull/105))
+- False negative around logging method without parameter ([#68](https://github.com/KengoTODA/findbugs-slf4j/pull/68))
 
 ### Added