📝 Update README and fix error message

Author: Komposten

README.md

@@ -10,7 +10,7 @@ public_suffix is a dart library for identifying the public suffixes (or TLDs), r
 - Identify suffix, root domain, registrable domain (root + suffix) and subdomain from URLs.
 - Provide your own list of suffix rules to keep up to date with the rules you need.
 - Get results from matching with only ICANN/IANA rules or also include private ones.
-	- For example, a private rule can see the full `github.io` as suffix while ICANN only recognises the `io` part.
+    - For example, a private rule can see the full `github.io` as suffix while ICANN only recognises the `io` part.
 - Parse punycode encoded URLs and get both encoded and decoded results.
 - Check if URLs are subdomains, have valid domain parts, or end with known suffixes.
 
@@ -32,22 +32,21 @@ public_suffix is a dart library for identifying the public suffixes (or TLDs), r
 import 'package:public_suffix/public_suffix.dart';
 
 main() {
-  // Load a list of suffix rules from publicsuffix.org.
+  // Load a list of suffix rules.
   var suffixListString = 'load the list into this string';
   DefaultSuffixRules.initFromString(suffixListString);
-	  
+  
   // Parse a URL.
-  var parsedUrl =
-        PublicSuffix.fromString('https://www.komposten.github.io');
-	  
+  var parsedUrl = PublicSuffix(urlString: 'https://www.komposten.github.io');
+  
   // Obtain information using the many getters, for example:
   print(parsedUrl.suffix);      // github.io
   print(parsedUrl.root);        // komposten
   print(parsedUrl.domain);      // komposten.github.io
   print(parsedUrl.icannDomain); // github.io
 
   // public_suffix also supports punycoded URLs:
-  parsedUrl = PublicSuffix.fromString('https://www.xn--6qq79v.cn');
+  parsedUrl = PublicSuffix(urlString: 'https://www.xn--6qq79v.cn');
   print(parsedUrl.domain);             // xn--6qq79v.cn
   print(parsedUrl.punyDecoded.domain); // 你好.cn
 }
@@ -112,7 +111,7 @@ Just like before, there are two ways of doing this:
    }
    ```
 
-**Note:** Don't overload publicsuffix.org's servers by repeatedly retrieving the suffix list from them. Cache a copy somewhere instead, and update that copy only when the master copy is updated.
+**Note:** Don't overload publicsuffix.org's servers by repeatedly retrieving the suffix list from them. Cache a copy somewhere instead, and update that copy when the master copy is updated.
 
 ## Utility functions
 Several utility functions can be found in the `DomainUtils` class (imported from `public_suffix.dart`). These currently include:

lib/src/default_suffix_rules.dart

@@ -28,7 +28,7 @@ class DefaultSuffixRules {
     if (hasInitialised()) {
       return rules!;
     } else {
-      throw StateError('PublicSuffixList has not been initialised!');
+      throw StateError('DefaultSuffixRules has not been initialised!');
     }
   }