DEV: update logster to stable release

DEV: update logster to stable release

This update logster to the stable 2.0.1 release instead of running a pre release

diff --git a/Gemfile.lock b/Gemfile.lock
index 9904a8f..8f894e2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -183,7 +183,7 @@ GEM
     logstash-event (1.2.02)
     logstash-logger (0.26.1)
       logstash-event (~> 1.2)
-    logster (2.0.0.pre)
+    logster (2.0.1)
     loofah (2.2.3)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)

GitHub sha: 4cfc2016