Update logstash-output-amazon_es.gemspec (#111)
Update logstash-output-amazon_es.gemspec (#111)

Bump bugfix for Issues: 
* https://github.com/awslabs/logstash-output-amazon_es/issues/105
* https://github.com/awslabs/logstash-output-amazon_es/issues/101
awslabs/logstash-output-amazon_es