Newer version do not show up via logstash-plugin install

[sstarcher]

logstash-plugin list --verbose logstash-input-redis
logstash-input-redis (3.1.4)

I would expect 3.4.1 to show up as it's the latest

[yaauie]

It looks like the cause of this is a dependency mismatch. I'll attempt to chase it down shortly.

Notes for future-me:

• logstash-output-redis specifies `'redis', '~> 4'
• logstash-input-redis <= 3.1.4 accept any redis
• logstash-input-redis >= 3.1.5 require redis ~> 3

When Logstash dependency manager attempts to install both logstash-output-redis and logstash-input-redis, the latest input that works is 3.1.4.

[lifeofguenter]

Related: #76