Update pedantic and resolved some linter nits

Author: haarts

example/lib/main.dart

@@ -8,7 +8,7 @@ var loggerNoStack = Logger(
   printer: PrettyPrinter(methodCount: 0),
 );
 
-void main() async {
+void main() {
   demo();
 }
 

lib/src/outputs/console_output.dart

@@ -7,8 +7,6 @@ import 'package:logger/src/log_output.dart';
 class ConsoleOutput extends LogOutput {
   @override
   void output(OutputEvent event) {
-    for (var line in event.lines) {
-      print(line);
-    }
+    event.lines.forEach(print);
   }
 }

lib/src/printers/pretty_printer.dart

@@ -65,9 +65,7 @@ class PrettyPrinter extends LogPrinter {
     this.printEmojis = true,
     this.printTime = false,
   }) {
-    if (_startTime == null) {
-      _startTime = DateTime.now();
-    }
+    _startTime ??= DateTime.now();
 
     var doubleDividerLine = StringBuffer();
     var singleDividerLine = StringBuffer();
@@ -121,7 +119,7 @@ class PrettyPrinter extends LogPrinter {
         if (match.group(2).startsWith('package:logger')) {
           continue;
         }
-        var newLine = ("#$count   ${match.group(1)} (${match.group(2)})");
+        var newLine = "#$count   ${match.group(1)} (${match.group(2)})";
         formatted.add(newLine.replaceAll('<anonymous closure>', '()'));
         if (++count == methodCount) {
           break;
@@ -140,14 +138,14 @@ class PrettyPrinter extends LogPrinter {
 
   String getTime() {
     String _threeDigits(int n) {
-      if (n >= 100) return "${n}";
-      if (n >= 10) return "0${n}";
-      return "00${n}";
+      if (n >= 100) return "$n";
+      if (n >= 10) return "0$n";
+      return "00$n";
     }
 
     String _twoDigits(int n) {
-      if (n >= 10) return "${n}";
-      return "0${n}";
+      if (n >= 10) return "$n";
+      return "0$n";
     }
 
     var now = DateTime.now();
@@ -222,14 +220,13 @@ class PrettyPrinter extends LogPrinter {
 
     if (stacktrace != null) {
       for (var line in stacktrace.split('\n')) {
-        buffer.add('${color}$verticalLine $line');
+        buffer.add('$color$verticalLine $line');
       }
       buffer.add(color(_middleBorder));
     }
 
     if (time != null) {
-      buffer.add(color('$verticalLine $time'));
-      buffer.add(color(_middleBorder));
+      buffer..add(color('$verticalLine $time'))..add(color(_middleBorder));
     }
 
     var emoji = _getEmoji(level);

pubspec.yaml

@@ -9,4 +9,4 @@ environment:
 
 dev_dependencies:
   test: any
-  pedantic: ^1.8.0
+  pedantic: ^1.9.0