docs: update for 0.18.0 release

Author: timonback

docs/configuration/configuration.mdx

@@ -72,11 +72,11 @@ The default Jackson `ModelResolver` supports schema definitions via `@Schema` to
 
 ### Using `@Schema`
 
-The `@Schema` annotation allows to set many properties like `description`, `example`, `requiredMode` to document payloads.
+The `@Schema` annotation allows to set many properties like `description`, `example`, `requiredMode`, `minimum` to document payloads.
 
-All properties are part of the produced AsyncApi file. However, not all are displayed in `springwolf-ui`. The ones listed above are included.
+All properties are part of the produced AsyncApi file. However, not all are displayed in `springwolf-ui` (see [#378](https://github.com/springwolf/springwolf-core/issues/378))
 
-### Usage
+#### Usage
 
 Add the following dependency:
 
@@ -114,6 +114,26 @@ The `@AsyncMessage.description` field will always override the `@Schema` descrip
 
 For a full example, take a look at [ExamplePayloadDto.java in `springwolf-amqp-example`](https://github.com/springwolf/springwolf-core/blob/master/springwolf-examples/springwolf-amqp-example/src/main/java/io/github/stavshamir/springwolf/example/amqp/dtos/ExamplePayloadDto.java)
 
+#### Primitive, final and external classes
+
+When the `@Schema` annotation cannot be attached to the payload class (i.e. `java.lang.String`), the payload can be wrapped in an envelope class. The actual payload is a field within this class (`StringEnvelope`), marked using `@AsyncApiPayload` and documented using the `@Schema` annotation.
+
+```java
+@AsyncListener( operation = @AsyncOperation( channelName = TOPIC,
+     payloadType = StringEnvelope.class) // <- envelope class
+)
+public void receiveStringPayload(String stringPayload) { // <- The original class is used here
+    // ...
+}
+
+@Data
+static class StringEnvelope {
+    @AsyncApiPayload // <- The annotation marker
+    @Schema(description = "Payload description using @Schema annotation and @AsyncApiPayload within envelope class")
+    private final String payload;
+}
+```
+
 ### `json-schema`
 
 The [`springwolf-add-ons/springwolf-json-schema`](https://github.com/springwolf/springwolf-core/tree/master/springwolf-add-ons/springwolf-json-schema) adds the [json-schema](https://json-schema.org) schema to the AsyncApi document. 

docs/configuration/documenting-messages.mdx

@@ -1,3 +1,3 @@
 dependencies {
-    implementation 'io.swagger.core.v3:swagger-core:2.2.10'
+    implementation 'io.swagger.core.v3:swagger-core:2.2.20'
 }

docs/configuration/snippets/_schema_groovy.gradle

@@ -2,6 +2,6 @@
     <dependency>
         <groupId>io.swagger.core.v3</groupId>
         <artifactId>swagger-core</artifactId>
-        <version>2.2.10</version>
+        <version>2.2.20</version>
     </dependency>
 </dependencies>

docs/configuration/snippets/_schema_maven.xml

@@ -1,7 +1,7 @@
 dependencies {
     // Provides the documentation API
-    implementation 'io.github.springwolf:springwolf-kafka:0.17.0'
+    implementation 'io.github.springwolf:springwolf-kafka:0.18.0'
 
     // Provides the UI - optional (recommended)
-    runtimeOnly 'io.github.springwolf:springwolf-ui:0.17.0'
-}
+    runtimeOnly 'io.github.springwolf:springwolf-ui:0.18.0'
+}

docs/snippets/_springwolf_groovy.gradle

@@ -3,12 +3,12 @@
     <dependency>
         <groupId>io.github.springwolf</groupId>
         <artifactId>springwolf-kafka</artifactId>
-        <version>0.17.0</version>
+        <version>0.18.0</version>
     </dependency>
     <!-- Provides the UI - optional (recommended) -->
     <dependency>
         <groupId>io.github.springwolf</groupId>
         <artifactId>springwolf-ui</artifactId>
-        <version>0.17.0</version>
+        <version>0.18.0</version>
     </dependency>
-</dependencies>
+</dependencies>