Tests against openjdk17 and 21

README.md

@@ -3,12 +3,11 @@ cafebabe
 ![Build Status](https://github.com/staktrace/cafebabe/actions/workflows/test.yml/badge.svg)
 [![Crate](https://img.shields.io/crates/v/cafebabe.svg)](https://crates.io/crates/cafebabe)
 
-cafebabe is a parser for .class files, which are generated by the javac compiler and other compilers targeting the JVM.
-It supports the class file format from Java 17 (September 2021).
+cafebabe is a parser for `.class` files, which are generated by the javac compiler and other compilers targeting the JVM.
+It supports the class file format from Java 21 (September 2023).
 
 There are a bunch of different class file parsers available on crates.io. Main differentiators for `cafebabe` are:
-- *Support for Java 17.*
-  As of this writing, others generally support Java 8 / Java 11.
+- *Support for Java 21.*
 - *A better user API*.
   Most other parsers expose the raw u16 values of the constant pool, which means you as the user end up being responsible for doing the constant pool lookup.
   This also means you have to do type validation (e.g. make sure the constant pool entry you're reading is actually a classinfo type, or whatever).
@@ -30,8 +29,8 @@ There are a bunch of different class file parsers available on crates.io. Main d
 
 Current status
 --------------
-The main parsing code is fully implemented. All structures (including attributes) described in Chapter 4 of the JVM spec are supported.
-The entire `modules` file of the OpenJDK 16 distribution can be parsed without errors.
+The main parsing code is fully implemented. All structures (including attributes) described in [Chapter 4 of the JVM spec](https://docs.oracle.com/javase/specs/jvms/se21/html/jvms-4.html) are supported.
+The entire `modules` file of the OpenJDK 16/17/21 distributions can be parsed without errors.
 `cafebabe` will do some kinds of validation/checking at parse time, but not everything described in Chapter 4 of the JVM spec.
 It does all of section 4.8 validation ("Format checking") except possibly some of the attribute validations (the Signature attribute, for instance).
 A reasonable goal for this project is to fully implement section 4.8, so patches would be accepted for additional format checking.
@@ -40,4 +39,4 @@ Q&A
 ---
 *Why is the project called `cafebabe`?*
 
-Because the first 4 bytes in any valid class file are a magic identifier with the value 0xCAFEBABE.
+Because the first 4 bytes in any valid class file are a magic identifier with the value 0xCAFEBABE. ☕