set default_codec doc attribute

Author: jsvd

CHANGELOG.md

@@ -1,3 +1,6 @@
+## 3.1.3
+ - Docs: Set the default_codec doc attribute.
+
 ## 3.1.2
  - Update gemspec summary
 

docs/index.asciidoc

@@ -1,5 +1,6 @@
 :plugin: log4j
 :type: input
+:default_codec: plain
 
 ///////////////////////////////////////////
 START - GENERATED VARIABLES, DO NOT EDIT!
@@ -166,4 +167,6 @@ http://www.haproxy.org/download/1.5/doc/proxy-protocol.txt
 
 
 [id="plugins-{type}s-{plugin}-common-options"]
-include::{include_path}/{type}.asciidoc[]
+include::{include_path}/{type}.asciidoc[]
+
+:default_codec!:

logstash-input-log4j.gemspec

@@ -1,7 +1,7 @@
 Gem::Specification.new do |s|
 
  s.name = 'logstash-input-log4j'
- s.version = '3.1.2'
+ s.version = '3.1.3'
  s.licenses = ['Apache License (2.0)']
  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"