Bump meta to 1.1.0

pkg/meta/CHANGELOG.md

+## 1.1.0
+* Introduce `@alwaysThrows` to declare that a function always throws
+    (SDK issue [17999](https://github.com/dart-lang/sdk/issues/17999)). This
+    is first available in Dart SDK 1.25.0-dev.1.0.
+
+    ```dart
+    import 'package:meta/meta.dart';
+
+    // Without knowing that [failBigTime] always throws, it looks like this
+    // function might return without returning a bool.
+    bool fn(expected, actual) {
+      if (expected != actual)
+        failBigTime(expected, actual);
+      else
+        return True;
+    }
+
+    @alwaysThrows
+    void failBigTime(expected, actual) {
+      throw new StateError('Expected $expected, but was $actual.');
+    }
+    ```
+
 ## 1.0.4
 * Introduce `@virtual` to allow field overrides in strong mode
     (SDK issue [27384](https://github.com/dart-lang/sdk/issues/27384)).
 
     ```dart
     import 'package:meta/meta.dart' show virtual;
     class Base {
       @virtual int x;
     }
     class Derived extends Base {
@@ skipping 53 matching lines @@
 constructor must use the keyword `const` unless one or more of the
 arguments to the constructor is not a compile-time constant.
 
 ## 0.9.0
 * Introduce `@protected` annotation for members that must only be called from
 instance members of subclasses.
 * Introduce `@required` annotation for optional parameters that should be treated
 as required.
 * Introduce `@mustCallSuper` annotation for methods that must be invoked by all
 overriding methods.