v_1.1.2-1

• [FIX] Fix NPE when substituting blank variables
• [FIX] Update SyslogAppender to format days according to the spec (no leading zeroes) (LOGBACK-936)
• [FIX] Prevent a possible NPE in SyslogAppenderBase.close() (LOGBACK-960)
• [FIX] Improve multi-threaded logging performance in OutputStreamAppender (LOGBACK-268)
• [NEW] Add support for shutdown hook configuration