[meta] Release 1.18.2

Release a version of `package:meta` that includes the pragmas added
in https://dart-review.googlesource.com/c/sdk/+/487360 so that the
record_use experiment works with a `package:meta` from pub.

Change-Id: Iab955796c1673f9cf4b44ba25ac331a9ca8c78ac
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/488460
Reviewed-by: Lasse Nielsen <lrn@google.com>
Commit-Queue: Daco Harkes <dacoharkes@google.com>

pkg/meta/CHANGELOG.md

@@ -1,4 +1,4 @@
-## 1.18.2-wip
+## 1.18.2
 
 - Change private types in the public API signatures to `Object`.
 - Update documentation to follow the "single line first paragraph" style.

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: 1.18.2-wip
+version: 1.18.2
 description: >-
  Annotations used to express developer intentions that can't otherwise be
  deduced by statically analyzing source code.