[skip ci] update gemspec summary

Author: jsvd

CHANGELOG.md

@@ -1,3 +1,6 @@
+## 3.1.6
+  - Update gemspec summary
+
 ## 3.1.5
   - Pin 'redis' gem dependency to major version range 3.x
 

logstash-input-redis.gemspec

@@ -1,9 +1,9 @@
 Gem::Specification.new do |s|
 
   s.name            = 'logstash-input-redis'
-  s.version         = '3.1.5'
+  s.version         = '3.1.6'
   s.licenses        = ['Apache License (2.0)']
-  s.summary         = "This input will read events from a Redis instance"
+  s.summary         = "Reads events from a Redis instance"
   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           = '[email protected]'