Java Feign client generator: HTTP header name should be named Accept not Accepts

[daknin]

Description

The Feign generator is producing Api classes with an incorrect header name.
e.g.
@RequestLine("DELETE /pet/{petId}")
@headers({
"Content-type: application/json",
"Accepts: application/json",
"apiKey: {apiKey}"
})
void deletePet(@param("petId") Long petId, @param("apiKey") String apiKey);

The header should be named Accept not Accepts.

Swagger-codegen version

2.1.6

[daknin]

Pull request: #2984

[daknin]

PR has been merged so closing issue

[wing328]

@daknin thanks again for the contribution.