Get rid of all the library tags.

lib/src/span_scanner.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library string_scanner.span_scanner;
-
 import 'package:source_span/source_span.dart';
 
 import 'eager_span_scanner.dart';
 import 'exception.dart';
 import 'line_scanner.dart';
 import 'string_scanner.dart';
 import 'utils.dart';
 
 /// A subclass of [LineScanner] that exposes matched ranges as source map
 /// [Span]s.
@@ skipping 89 matching lines @@
 class _SpanScannerState implements LineScannerState {
   /// The [SpanScanner] that created this.
   final SpanScanner _scanner;
 
   final int position;
   int get line => _scanner._sourceFile.getLine(position);
   int get column => _scanner._sourceFile.getColumn(position);
 
   _SpanScannerState(this._scanner, this.position);
 }