Update feign version of java client generator (feign library)

[oteichmann]

Description

Update Feign to latest version of https://github.com/OpenFeign/feign

Swagger-codegen version

2.2.3-SNAPSHOT

Swagger declaration file content or url

swagger-codegen/modules/swagger-codegen/src/main/resources/Java/libraries/feign/pom.mustache

Command line used for generation

./bin/java-petstore-feign.sh

Steps to reproduce

Related issues

Suggest a Fix

Update dependencies

[wing328]

Closed via #5114. Thanks for the PR