DEV: Bump Logster version to 2.3.1

DEV: Bump Logster version to 2.3.1

Commits since last version bump: Comparing 5cdcb76...c5bcb8e · discourse/logster · GitHub

diff --git a/Gemfile.lock b/Gemfile.lock
index db48520..fc80605 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -169,7 +169,7 @@ GEM
     logstash-event (1.2.02)
     logstash-logger (0.26.1)
       logstash-event (~> 1.2)
-    logster (2.3.0)
+    logster (2.3.1)
     loofah (2.2.3)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)

GitHub sha: 50368940