Update README.md

README.md

@@ -5,21 +5,21 @@
 To generate a timeline for your project add this section to your `pom.xml`:
 
 ```xml
+<?xml version="1.0" encoding="UTF-8"?>
 <extensions>
-  <extension>
-    <groupId>io.takari.maven</groupId>
-    <artifactId>maven-timeline</artifactId>
-    <version>2.0.0</version>
+    <extension>
+        <groupId>io.takari.maven</groupId>
+        <artifactId>maven-timeline</artifactId>
+        <version>2.0.0</version>
   </extension>
 </extensions>
 ```
 
-
 Once your project has run you will have a `target/timeline/timeline.html` in the top-level of your project. The output will look something like the following:
 
 ![Maven Timeline](maven-timeline.png)
 
 ## Building
 
-Build time requirement is Java 11 and recent Maven (3.8+ recommended). It uses the new "release" flag of compiler to produce Java 7 bytecode.
-Hence, runtime Java requirement is still Java 7.
+Build time requirement is Java 11+ and recent Maven (3.9+ recommended).
+Runtime Java requirement is Java 8+.