docs: update README

README.md

@@ -1,67 +1,66 @@
 joni
 ====
 
-[![Maven Central](https://img.shields.io/maven-central/v/org.jruby.joni/joni.svg)](http://search.maven.org/#search%7Cga%7C1%7Cg%3A%22org.jruby.joni%22)
-[![Build Status](https://github.com/jruby/joni/workflows/Java%20CI%20with%20Maven/badge.svg?branch=master)](https://github.com/jruby/joni/actions)
+[![Maven Central](https://img.shields.io/maven-central/v/org.jruby.joni/joni)](https://central.sonatype.com/artifact/org.jruby.joni/joni)
+[![Build Status](https://github.com/jruby/joni/actions/workflows/maven.yml/badge.svg)](https://github.com/jruby/joni/actions/workflows/maven.yml)
 
-Java port of Oniguruma regexp library
+Java port of [Oniguruma](https://github.com/kkos/oniguruma) regexp library
 
 ## Usage
 
 ### Imports
-  ```java
-      import org.jcodings.specific.UTF8Encoding;
-      import org.joni.Matcher;
-      import org.joni.Option;
-      import org.joni.Regex;
-  ```
+
+```java
+import org.jcodings.specific.UTF8Encoding;
+import org.joni.Matcher;
+import org.joni.Option;
+import org.joni.Regex;
+```
 
 ### Matching
 
-  ```java
-
-      byte[] pattern = "a*".getBytes();
-      byte[] str = "aaa".getBytes();
+```java
+byte[] pattern = "a*".getBytes();
+byte[] str = "aaa".getBytes();
 
-      Regex regex = new Regex(pattern, 0, pattern.length, Option.NONE, UTF8Encoding.INSTANCE);
-      Matcher matcher = regex.matcher(str);
-      int result = matcher.search(0, str.length, Option.DEFAULT);
-  ```
+Regex regex = new Regex(pattern, 0, pattern.length, Option.NONE, UTF8Encoding.INSTANCE);
+Matcher matcher = regex.matcher(str);
+int result = matcher.search(0, str.length, Option.DEFAULT);
+```
 
 ### Using captures
 
-  ```java
-    byte[] pattern = "(a*)".getBytes();
-    byte[] str = "aaa".getBytes();
+```java
+byte[] pattern = "(a*)".getBytes();
+byte[] str = "aaa".getBytes();
 
-    Regex regex = new Regex(pattern, 0, pattern.length, Option.NONE, UTF8Encoding.INSTANCE);
-    Matcher matcher = regex.matcher(str);
-    int result = matcher.search(0, str.length, Option.DEFAULT);
-    if (result != -1) {
-        Region region = matcher.getEagerRegion();
-    }
-  ```
+Regex regex = new Regex(pattern, 0, pattern.length, Option.NONE, UTF8Encoding.INSTANCE);
+Matcher matcher = regex.matcher(str);
+int result = matcher.search(0, str.length, Option.DEFAULT);
+if (result != -1) {
+    Region region = matcher.getEagerRegion();
+}
+```
 
 ### Using named captures
 
-  ```java
-    byte[] pattern = "(?<name>a*)".getBytes();
-    byte[] str = "aaa".getBytes();
-
-    Regex regex = new Regex(pattern, 0, pattern.length, Option.NONE, UTF8Encoding.INSTANCE);
-    Matcher matcher = regex.matcher(str);
-    int result = matcher.search(0, str.length, Option.DEFAULT);
-    if (result != -1) {
-        Region region = matcher.getEagerRegion();
-        for (Iterator<NameEntry> entry = regex.namedBackrefIterator(); entry.hasNext();) {
-            NameEntry e = entry.next();
-            int number = e.getBackRefs()[0]; // can have many refs per name
-            // int begin = region.beg[number];
-            // int end = region.end[number];
-
-        }
+```java
+byte[] pattern = "(?<name>a*)".getBytes();
+byte[] str = "aaa".getBytes();
+
+Regex regex = new Regex(pattern, 0, pattern.length, Option.NONE, UTF8Encoding.INSTANCE);
+Matcher matcher = regex.matcher(str);
+int result = matcher.search(0, str.length, Option.DEFAULT);
+if (result != -1) {
+    Region region = matcher.getEagerRegion();
+    for (Iterator<NameEntry> entry = regex.namedBackrefIterator(); entry.hasNext();) {
+        NameEntry e = entry.next();
+        int number = e.getBackRefs()[0]; // can have many refs per name
+        // int begin = region.beg[number];
+        // int end = region.end[number];
     }
-  ```
+}
+```
 
 ## License