Source of SLF4J

[[Java]] > [[SLF4J]]

- http://www.slf4j.org/

*. [#s0442a12]

- SLF4J、Logback、Log4Jの関係を挙動とともに整理する
--  https://qiita.com/NagaokaKenichi/items/9febd2e559331152fcf8