Bump package meta to 1.15.0

Change-Id: I53f7e0d9601f1e51f8bce874b449f063926b2001
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/365281
Reviewed-by: Phil Quitslund <pquitslund@google.com>
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Samuel Rawlins <srawlins@google.com>

pkg/meta/CHANGELOG.md

@@ -1,4 +1,4 @@
-## 1.15.0-dev
+## 1.15.0
 
 - Updated `@mustBeOverridden` to only flag missing overrides in concrete
   classes; in other words, abstract classes (including implicitly abstract, i.e
@@ -33,8 +33,8 @@
   See <https://github.com/dart-lang/sdk/issues/52965> for more information.
 - Introduce `TargetKind.optionalParameter`, to indicate that an annotation is
   valid on any optional parameter declaration.
-- Introduce `TargetKind.instanceMember`, to indicate that an annotation is valid
-  on any instance member declaration.
+- Introduce `TargetKind.overridableMember`, to indicate that an annotation is
+  valid on any instance member declaration.
 
 ## 1.14.0
 

pkg/meta/pubspec.yaml

@@ -1,7 +1,7 @@
 name: meta
 # Note, because version `2.0.0` was mistakenly released,
 # the next major version must be `3.x.y`.
-version: 1.15.0-dev
+version: 1.15.0
 description: >-
  Annotations used to express developer intentions that can't otherwise be
  deduced by statically analyzing source code.