Fixes asciidoctor#280 Upgrade Doxia for maven-site-plugin 3.4+ compat…

…ibility (asciidoctor#289)

* fixes asciidoctor#280 upgrades Doxia for compatibility with maven-site-plugin 3.4+

* upgraded README

README.adoc

@@ -1,6 +1,6 @@
 = Asciidoctor Maven Plugin
 // Metadata
-:release-version: 1.5.3
+:release-version: 1.5.5
 // Settings
 :page-layout: base
 :idprefix:
@@ -314,6 +314,8 @@ This allows an easier way of defining common configuration options.
 
 To author your Maven-generated site in AsciiDoc, you must first add a dependency on the Asciidoctor plugin to your maven-site-plugin declaration.
 
+IMPORTANT: Since asciidoctor-maven-plugin v1.5.6 it is required to use maven-site-plugin v3.4 or above.
+
 [source,xml,subs=attributes+]
 .Maven site integration
 -----

README_zh-CN.adoc

@@ -2,7 +2,7 @@
 :translators: D瓜哥
 ifdef::env-github[Translated by: {translators}]
 // Metadata
-:release-version: 1.5.2
+:release-version: 1.5.5
 // Settings
 :page-layout: base
 :idprefix:

pom.xml

@@ -80,7 +80,7 @@
         <plexus.component.metadata.version>1.5.5</plexus.component.metadata.version>
         <netty.version>4.0.38.Final</netty.version>
         <commons.io.version>2.4</commons.io.version>
-        <doxia.version>1.6</doxia.version>
+        <doxia.version>1.7</doxia.version>
         <gmaven.version>1.5</gmaven.version>
     </properties>
 

src/it/maven-site-plugin/pom.xml

@@ -12,7 +12,8 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-site-plugin</artifactId>
-                <version>3.3</version>
+                <!-- doxia 1.7 is only compatible with maven-site-plugin 3.4 or + -->
+                <version>3.4</version>
                 <configuration>
                     <asciidoc>
                         <templateDirs>