[skip ci] update gemspec summary

Author: jsvd

CHANGELOG.md

@@ -1,3 +1,6 @@
+## 3.1.2
+ - Update gemspec summary
+
 ## 3.1.1
  - Fix some documentation issues
 

logstash-input-log4j.gemspec

@@ -1,9 +1,9 @@
 Gem::Specification.new do |s|
 
  s.name = 'logstash-input-log4j'
- s.version = '3.1.1'
+ s.version = '3.1.2'
  s.licenses = ['Apache License (2.0)']
- s.summary = "Read events over a TCP socket from a Log4j SocketAppender"
+ s.summary = "Reads events over a TCP socket from a Log4j `SocketAppender` object"
  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"
  s.authors = ["Elastic"]
  s.email = 'info@elastic.co'