[Sttp] Update default version to 2.2.0

Author: ghostbuster91

docs/generators/scala-sttp.md

@@ -7,7 +7,7 @@ sidebar_label: scala-sttp
 | ------ | ----------- | ------ | ------- |
 |allowUnicodeIdentifiers|boolean, toggles whether unicode identifiers are allowed in names or not, default is false| |false|
 |apiPackage|package for generated api classes| |null|
-|sttpClientVersion|Option. Allows to override default version of sttp client library.|2.1.5
+|sttpClientVersion|Option. Allows to override default version of sttp client library. Minimal version required for this project to compile is 2.2.0 |2.2.0
 |dateLibrary|Option. Date library to use|<dl><dt>**joda**</dt><dd>Joda (for legacy app)</dd><dt>**java8**</dt><dd>Java 8 native JSR310 (prefered for JDK 1.8+)</dd></dl>|java8|
 |jodaTimeVersion|Only if dateLibrary was set to joda. Allows to override default jodatime version.|2.10.6
 |json4sVersion|Only if jsonLibrary was set to json4s. Allows to override default json4s version.|3.6.8

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/ScalaSttpClientCodegen.java

@@ -42,7 +42,7 @@
 
 public class ScalaSttpClientCodegen extends AbstractScalaCodegen implements CodegenConfig {
     private static final StringProperty STTP_CLIENT_VERSION = new StringProperty("sttpClientVersion", "The version of " +
-            "sttp client", "2.1.5");
+            "sttp client", "2.2.0");
     private static final BooleanProperty USE_SEPARATE_ERROR_CHANNEL = new BooleanProperty("separateErrorChannel",
             "Whether to return response as " +
                     "F[Either[ResponseError[ErrorType], ReturnType]]] or to flatten " +