Support the latest dependencies, prepare for release

CHANGELOG.md

@@ -1,3 +1,8 @@
+## 2.0.17
+
+- Update to latest dependencies.
+- Require Dart 2.12.
+
 ## 2.0.16
 
 - Add a summary of the most broken links (as opposed to just warnings) 

bin/linkcheck.dart

@@ -6,10 +6,10 @@ import 'dart:io';
 import 'package:linkcheck/linkcheck.dart';
 
 Future<int> main(List<String> arguments) async {
-  await runZoned(() async {
+  await runZonedGuarded(() async {
     // Run the link checker. The returned value will be the program's exit code.
     exitCode = await run(arguments, stdout);
-  }, onError: (Object e, StackTrace stackTrace) {
+  }, (Object e, StackTrace stackTrace) {
     stderr.writeln("INTERNAL ERROR: Sorry! Please open "
         "https://github.com/filiph/linkcheck/issues/new "
         "in your favorite browser and copy paste the following output there:"

lib/linkcheck.dart

@@ -28,7 +28,7 @@ const hostsFlag = "hosts";
 const inputFlag = "input-file";
 const redirectFlag = "show-redirects";
 const skipFlag = "skip-file";
-const version = "2.0.16";
+const version = "2.0.17";
 const versionFlag = "version";
 final _portOnlyRegExp = RegExp(r"^:\d+$");