Bump version to 2.2.0 and add release notes.

Author: magnusbaeck

CHANGELOG.md

@@ -1,3 +1,6 @@
+# 2.2.0
+  - Add 'metadata' option that enables inclusion of the @metadata field in the output.
+
 # 2.1.3
   - Depend on logstash-core-plugin-api instead of logstash-core, removing the need to mass update plugins on major releases of logstash
 # 2.1.2

logstash-codec-json_lines.gemspec

@@ -1,7 +1,7 @@
 Gem::Specification.new do |s|
 
   s.name            = 'logstash-codec-json_lines'
-  s.version         = '2.1.3'
+  s.version         = '2.2.0'
   s.licenses        = ['Apache License (2.0)']
   s.summary         = "This codec will decode streamed JSON that is newline delimited."
   s.description     = "This gem is a logstash plugin required to be installed on top of the Logstash core pipeline using $LS_HOME/bin/plugin install gemname. This gem is not a stand-alone program"