Add @generated to http api (for generated code with java module system)

Author: rbygrave

http-api/pom.xml

@@ -4,12 +4,12 @@
 
   <groupId>io.avaje</groupId>
   <artifactId>avaje-http-api</artifactId>
-  <version>1.1-SNAPSHOT</version>
+  <version>1.1</version>
 
   <parent>
     <groupId>org.avaje</groupId>
     <artifactId>java8-oss</artifactId>
-    <version>2.2</version>
+    <version>2.3</version>
   </parent>
 
   <scm>

http-api/src/main/java/io/avaje/http/api/Generated.java

@@ -0,0 +1,12 @@
+package io.avaje.http.api;
+
+/**
+ * Marker for generated code.
+ */
+public @interface Generated {
+
+  /**
+   * The name of the code generator.
+   */
+  String value();
+}