Prepare 4.2.1 release (#4494)

* prepare 4.2.1 release

* use stable version in test/example

Author: wing328

README.md

@@ -2,7 +2,7 @@
 
 <div align="center">
 
-[Master](https://github.com/OpenAPITools/openapi-generator/tree/master) (`4.2.1-SNAPSHOT`): [![Build Status](https://img.shields.io/travis/OpenAPITools/openapi-generator/master.svg?label=Integration%20Test)](https://travis-ci.org/OpenAPITools/openapi-generator)
+[Master](https://github.com/OpenAPITools/openapi-generator/tree/master) (`4.2.1`): [![Build Status](https://img.shields.io/travis/OpenAPITools/openapi-generator/master.svg?label=Integration%20Test)](https://travis-ci.org/OpenAPITools/openapi-generator)
 [![Integration Test2](https://circleci.com/gh/OpenAPITools/openapi-generator.svg?style=shield)](https://circleci.com/gh/OpenAPITools/openapi-generator)
 [![Run Status](https://api.shippable.com/projects/5af6bf74e790f4070084a115/badge?branch=master)](https://app.shippable.com/github/OpenAPITools/openapi-generator)
 [![Windows Test](https://ci.appveyor.com/api/projects/status/github/openapitools/openapi-generator?branch=master&svg=true&passingText=Windows%20Test%20-%20OK&failingText=Windows%20Test%20-%20Fails)](https://ci.appveyor.com/project/WilliamCheng/openapi-generator-wh2wu)
@@ -109,7 +109,7 @@ OpenAPI Generator Version    | Release Date | Notes
 ---------------------------- | ------------ | -----
 5.0.0 (upcoming major release) [SNAPSHOT](https://oss.sonatype.org/content/repositories/snapshots/org/openapitools/openapi-generator-cli/5.0.0-SNAPSHOT/)| 13.05.2020 | Major release with breaking changes (no fallback)
 4.3.0 (upcoming minor release) [SNAPSHOT](https://oss.sonatype.org/content/repositories/snapshots/org/openapitools/openapi-generator-cli/4.3.0-SNAPSHOT/)| 29.02.2020 | Minor release (breaking changes with fallbacks)
-4.2.1 (upcoming patch release) [SNAPSHOT](https://oss.sonatype.org/content/repositories/snapshots/org/openapitools/openapi-generator-cli/4.2.1-SNAPSHOT/)| 15.11.2019 | Patch release
+4.2.1 (upcoming patch release) [SNAPSHOT](https://oss.sonatype.org/content/repositories/snapshots/org/openapitools/openapi-generator-cli/4.2.1/)| 15.11.2019 | Patch release
 [4.2.0](https://github.com/OpenAPITools/openapi-generator/releases/tag/v4.2.0) (latest stable release) | 31.10.2019 | Minor release (bug fixes, enhancements, breaking chanages with fallbacks)
 
 OpenAPI Spec compatibility: 1.0, 1.1, 1.2, 2.0, 3.0

modules/openapi-generator-cli/pom.xml

@@ -4,7 +4,7 @@
         <groupId>org.openapitools</groupId>
         <artifactId>openapi-generator-project</artifactId>
         <!-- RELEASE_VERSION -->
-        <version>4.2.1-SNAPSHOT</version>
+        <version>4.2.1</version>
         <!-- /RELEASE_VERSION -->
         <relativePath>../..</relativePath>
     </parent>

modules/openapi-generator-core/pom.xml

@@ -6,7 +6,7 @@
     <artifactId>openapi-generator-project</artifactId>
     <groupId>org.openapitools</groupId>
     <!-- RELEASE_VERSION -->
-    <version>4.2.1-SNAPSHOT</version>
+    <version>4.2.1</version>
     <!-- /RELEASE_VERSION -->
     <relativePath>../..</relativePath>
   </parent>

modules/openapi-generator-gradle-plugin/README.adoc

@@ -45,7 +45,7 @@ compileJava.dependsOn tasks.openApiGenerate
 [source,group]
 ----
 plugins {
-  id "org.openapi.generator" version "4.2.0"
+  id "org.openapi.generator" version "4.2.1"
 }
 ----
 

modules/openapi-generator-gradle-plugin/gradle.properties

@@ -1,5 +1,5 @@
 # RELEASE_VERSION
-openApiGeneratorVersion=4.2.1-SNAPSHOT
+openApiGeneratorVersion=4.2.1
 # /RELEASE_VERSION
 
 # BEGIN placeholders

modules/openapi-generator-gradle-plugin/pom.xml

@@ -4,7 +4,7 @@
         <groupId>org.openapitools</groupId>
         <artifactId>openapi-generator-project</artifactId>
         <!-- RELEASE_VERSION -->
-        <version>4.2.1-SNAPSHOT</version>
+        <version>4.2.1</version>
         <!-- /RELEASE_VERSION -->
         <relativePath>../..</relativePath>
     </parent>

modules/openapi-generator-gradle-plugin/samples/local-spec/README.md

@@ -18,5 +18,5 @@ gradle generateGoWithInvalidSpec
 The samples can be tested against other versions of the plugin using the `openApiGeneratorVersion` property. For example:
 
 ```bash
-gradle -PopenApiGeneratorVersion=4.2.0 openApiValidate
+gradle -PopenApiGeneratorVersion=4.2.1 openApiValidate
 ```

modules/openapi-generator-gradle-plugin/samples/local-spec/gradle.properties

@@ -1,3 +1,3 @@
 # RELEASE_VERSION
-openApiGeneratorVersion=4.1.1
+openApiGeneratorVersion=4.2.0
 # /RELEASE_VERSION

modules/openapi-generator-maven-plugin/README.md

@@ -12,7 +12,7 @@ Add to your `build->plugins` section (default phase is `generate-sources` phase)
     <groupId>org.openapitools</groupId>
     <artifactId>openapi-generator-maven-plugin</artifactId>
     <!-- RELEASE_VERSION -->
-    <version>4.2.0</version>
+    <version>4.2.1</version>
     <!-- /RELEASE_VERSION -->
     <executions>
         <execution>

modules/openapi-generator-maven-plugin/examples/java-client.xml

@@ -13,7 +13,7 @@
                 <groupId>org.openapitools</groupId>
                 <artifactId>openapi-generator-maven-plugin</artifactId>
                 <!-- RELEASE_VERSION -->
-                <version>4.1.3-SNAPSHOT</version>
+                <version>4.2.1</version>
                 <!-- /RELEASE_VERSION -->
                 <executions>
                     <execution>