Small fixes before publish (flutter#16)

Fix dartlang URLs in README
Fix long line in pubspec
Validate hints and warnings on Travis
Remove `new` from Example

.travis.yml

@@ -9,7 +9,7 @@ dart_task:
     xvfb: false
   # Set concurrency to 1 to avoid flakes on Travis
   - test: -p firefox -j 1
-  - dartanalyzer
+  - dartanalyzer: --fatal-infos --fatal-warnings .
 
 matrix:
   include:

README.md

@@ -21,9 +21,9 @@ using [`BooleanSelector.evaluate()`][evaluate]. The variables may be supplied as
 a list of strings, or as a function that takes a variable name and returns its
 value. For example:
 
-[parse]: https://www.dartdocs.org/documentation/boolean_selector/latest/boolean_selector/BooleanSelector/BooleanSelector.parse.html
+[parse]: https://pub.dev/documentation/boolean_selector/latest/boolean_selector/BooleanSelector/BooleanSelector.parse.html
 
-[evaluate]: https://www.dartdocs.org/documentation/boolean_selector/latest/boolean_selector/BooleanSelector/evaluate.html
+[evaluate]: https://pub.dev/documentation/boolean_selector/latest/boolean_selector/BooleanSelector/evaluate.html
 
 ```dart
 import 'package:boolean_selector/boolean_selector.dart';

example/example.dart

@@ -1,6 +1,6 @@
 import 'package:boolean_selector/boolean_selector.dart';
 
 void main(List<String> args) {
-  var selector = new BooleanSelector.parse("(x && y) || z");
+  var selector = BooleanSelector.parse("(x && y) || z");
   print(selector.evaluate((variable) => args.contains(variable)));
 }

pubspec.yaml

@@ -1,6 +1,8 @@
 name: boolean_selector
 version: 1.0.5
-description: A flexible syntax for boolean expressions, based on a simplified version of Dart's expression syntax.
+description: >-
+  A flexible syntax for boolean expressions, based on a simplified version of
+  Dart's expression syntax.
 author: Dart Team <[email protected]>
 homepage: https://github.com/dart-lang/boolean_selector