Update version and add changelog entry

Also updated license info in gemspec to be SPDX compliant.

Fixes #295

Author: robbavey

CHANGELOG.md

@@ -1,3 +1,6 @@
+## 8.2.1
+  - Changed Kafka client version to 2.0.1 [#295](https://github.com/logstash-plugins/logstash-input-kafka/pull/295)
+
 ## 8.2.0
   - Upgrade Kafka client to version 2.0.0
 

logstash-input-kafka.gemspec

@@ -1,7 +1,7 @@
 Gem::Specification.new do |s|
   s.name            = 'logstash-input-kafka'
-  s.version         = '8.2.0'
-  s.licenses        = ['Apache License (2.0)']
+  s.version         = '8.2.1'
+  s.licenses        = ['Apache-2.0']
   s.summary         = "Reads events from a Kafka topic"
   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         = ['Elasticsearch']