Prepare for 0.15.1 release (#1590)

* Almost ready for 0.15.1...

* test package docs

* fix pubspec

* Update CHANGELOG for revert of memoizer
diff --git a/CHANGELOG.md b/CHANGELOG.md
index bc93667..751e7f2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,14 @@
+## 0.15.1
+* Add SDK warning comparison to grind script (#1572)
+* Improve rendering of inline `<code>` (#1573)
+* Rename "Source Code" to "Implementation" (#1580)
+* Make page titles more prominent (#1581)
+* Detect macros declared in non-public symbols (#1584)
+* Const value cosmetic improvements with some restored linking (#1585)
+* Update to latest versions of args, resource, grinder (#1566, #1579)
+* Update to grinder scripts to serve flutter, SDK, and the test
+  package locally for testing (#1570, #1578)
+
 ## 0.15.0+1
 * Move sdk_footer_text to resources directory for compatibility
   with SDK build system (#1563)
diff --git a/lib/dartdoc.dart b/lib/dartdoc.dart
index f5ddf40..fb99c45 100644
--- a/lib/dartdoc.dart
+++ b/lib/dartdoc.dart
@@ -35,7 +35,7 @@
 
 const String name = 'dartdoc';
 // Update when pubspec version changes.
-const String version = '0.15.1-dev';
+const String version = '0.15.1';
 
 final String defaultOutDir = path.join('doc', 'api');
 
diff --git a/lib/src/model_utils.dart b/lib/src/model_utils.dart
index cfc3462..c1d3541 100644
--- a/lib/src/model_utils.dart
+++ b/lib/src/model_utils.dart
@@ -14,7 +14,7 @@
 import 'package:analyzer/src/generated/source_io.dart';
 import 'package:collection/collection.dart';
 import 'package:dartdoc/src/model.dart';
-import 'package:quiver_hashcode/hashcode.dart';
+import 'package:quiver/core.dart';
 
 import 'config.dart';
 
diff --git a/pubspec.lock b/pubspec.lock
index 7c300f3..f88cd2a 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -260,6 +260,13 @@
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.3.2"
+  quiver:
+    dependency: "direct main"
+    description:
+      name: quiver
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.27.0"
   quiver_hashcode:
     dependency: transitive
     description:
diff --git a/pubspec.yaml b/pubspec.yaml
index de0db9c..cd08ae6 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: dartdoc
 # Also update the `version` field in lib/dartdoc.dart.
-version: 0.15.1-dev
+version: 0.15.1
 author: Dart Team <misc@dartlang.org>
 description: A documentation generator for Dart.
 homepage: https://github.com/dart-lang/dartdoc
@@ -21,6 +21,7 @@
   mustache4dart: ^2.1.0
   package_config: '>=0.1.5 <2.0.0'
   path: ^1.3.0
+  quiver: ^0.27.0
   resource: '>=1.1.0 <3.0.0'
   stack_trace: ^1.4.2
   tuple: ^1.0.1
diff --git a/testing/test_package_docs/index.html b/testing/test_package_docs/index.html
index 21eda25..5b25b20 100644
--- a/testing/test_package_docs/index.html
+++ b/testing/test_package_docs/index.html
@@ -4,7 +4,7 @@
   <meta charset="utf-8">
   <meta http-equiv="X-UA-Compatible" content="IE=edge">
   <meta name="viewport" content="width=device-width, initial-scale=1">
-  <meta name="generator" content="made with love by dartdoc 0.15.1-dev">
+  <meta name="generator" content="made with love by dartdoc 0.15.1">
   <meta name="description" content="test_package API docs, for the Dart programming language.">
   <title>test_package - Dart API docs</title>