Does swagger-codegen 2.3.1 support a Scala 2.12 Client?

Description

I'm trying to use swagger-codegen to generate a Scala client for the following Swagger declaration file: https://github.com/checkr/flagr/blob/master/docs/api_docs/bundle.yaml. Ideally this client could use Scala 2.12, but the generated build.sbt looks like this:

version := "1.0.0"
name := "swagger-scala-client"
organization := "io.swagger"
scalaVersion := "2.11.12"

libraryDependencies ++= Seq(
  "com.fasterxml.jackson.module" %% "jackson-module-scala" % "2.9.2",
  "com.fasterxml.jackson.datatype" % "jackson-datatype-joda" % "2.9.2",
  "com.sun.jersey" % "jersey-core" % "1.19.4",
  "com.sun.jersey" % "jersey-client" % "1.19.4",
  "com.sun.jersey.contribs" % "jersey-multipart" % "1.19.4",
  "org.jfarcand" % "jersey-ahc-client" % "1.0.5",
  "io.swagger" % "swagger-core" % "1.5.8",
  "joda-time" % "joda-time" % "2.9.9",
  "org.joda" % "joda-convert" % "1.9.2",
  "org.scalatest" %% "scalatest" % "3.0.4" % "test",
  "junit" % "junit" % "4.12" % "test",
  "com.wordnik.swagger" %% "swagger-async-httpclient" % "0.3.5"
)

resolvers ++= Seq(
  Resolver.mavenLocal
)

scalacOptions := Seq(
  "-unchecked",
  "-deprecation",
  "-feature"
)

publishArtifact in (Compile, packageDoc) := false

According to https://mvnrepository.com/artifact/com.wordnik.swagger/swagger-async-httpclient, the
"com.wordnik.swagger" %% "swagger-async-httpclient" % "0.3.5" dependency only supports up to Scala 2.11. This is the only dependency that does not support Scala 2.12.

I'm wondering if there is a way around this to upgrade to Scala 2.12? Separately, will the 2.4.0 or 3.0.0 release of swagger-codgen support a Scala 2.12 client? Thanks!

Swagger-codegen version

2.3.1

Swagger declaration file content or url

https://github.com/checkr/flagr/blob/master/docs/api_docs/bundle.yaml

Command line used for generation

swagger-codegen generate -i https://github.com/checkr/flagr/blob/master/docs/api_docs/bundle.yaml -t <template_dir> -l scala

Start with the Scala generator invoked by the documented command and inspect the generated build.sbt, especially the swagger-async-httpclient dependency. Check the dependency's Scala 2.12 availability and the stated 2.4.0 and 3.0.0 release expectations; done would require a confirmed compatibility path or a clearly scoped generator change.