format file using 1.25.0-dev.8.0 (#14)

* format file using 1.25.0-dev.8.0

* remove unsupported stable sdk version from travis cfg

.travis.yml

diff --git a/.travis.yml b/.travis.yml
index b5590b3..df0d92c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,8 +5,6 @@
   - stable
   - 1.22.1
   - 1.21.1
-  - 1.20.1
-  - 1.19.1
 cache:
   directories:
     - $HOME/.pub-cache

lib/src/scan.dart

diff --git a/lib/src/scan.dart b/lib/src/scan.dart
index 3231072..3710062 100644
--- a/lib/src/scan.dart
+++ b/lib/src/scan.dart
@@ -10,6 +10,7 @@
 ///
 /// [spec]: http://www.w3.org/Protocols/rfc2616/rfc2616-sec2.html
 import 'package:string_scanner/string_scanner.dart';
+
 /// HTTP entities.
 ///
 /// Many of the regular expressions come from [section 2.2 of the HTTP
@@ -17,7 +18,6 @@
 ///
 /// [spec]: http://www.w3.org/Protocols/rfc2616/rfc2616-sec2.html
 
-
 /// An HTTP token.
 final token = new RegExp(r'[^()<>@,;:"\\/[\]?={} \t\x00-\x1F\x7F]+');