bump to 4.0.0

Fixes #21

Author: jsvd

CHANGELOG.md

@@ -1,5 +1,6 @@
-## 3.2.0
- - Added SSL support to this plugin (@michaelweiser)
+## 4.0.0
+ - Remove deprecated `workers_not_supported` call
+ - Use concurrency :single
 
 ## 3.1.1
   - Relax constraint on logstash-core-plugin-api to >= 1.60 <= 2.99

logstash-output-tcp.gemspec

@@ -1,7 +1,7 @@
 Gem::Specification.new do |s|
 
   s.name            = 'logstash-output-tcp'
-  s.version         = '3.2.0'
+  s.version         = '4.0.0'
   s.licenses        = ['Apache License (2.0)']
   s.summary         = "Write events over a TCP socket."
   s.description     = "This gem is a Logstash plugin required to be installed on top of the Logstash core pipeline using $LS_HOME/bin/logstash-plugin install gemname. This gem is not a stand-alone program"