update the CI configuration; prep for publishing (#44)

diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 430a85e..2144819 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -1,11 +1,8 @@
-# Set update schedule for GitHub Actions
-# See https://docs.github.com/en/free-pro-team@latest/github/administering-a-repository/keeping-your-actions-up-to-date-with-dependabot
-
+# Dependabot configuration file.
 version: 2
-updates:
 
-- package-ecosystem: "github-actions"
-  directory: "/"
-  schedule:
-    # Check for updates to GitHub Actions every weekday
-    interval: "daily"
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"
diff --git a/.github/workflows/test-package.yml b/.github/workflows/test-package.yml
index 79d8757..38089b6 100644
--- a/.github/workflows/test-package.yml
+++ b/.github/workflows/test-package.yml
@@ -11,6 +11,7 @@
 
 env:
   PUB_ENVIRONMENT: bot.github
+
 permissions: read-all
 
 jobs:
@@ -23,8 +24,8 @@
       matrix:
         sdk: [dev]
     steps:
-      - uses: actions/checkout@v3
-      - uses: dart-lang/setup-dart@v1
+      - uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8
+      - uses: dart-lang/setup-dart@6a218f2413a3e78e9087f638a238f6b40893203d
         with:
           sdk: ${{ matrix.sdk }}
       - id: install
@@ -50,8 +51,8 @@
         os: [ubuntu-latest]
         sdk: [2.12.0, dev]
     steps:
-      - uses: actions/checkout@v3
-      - uses: dart-lang/setup-dart@v1
+      - uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8
+      - uses: dart-lang/setup-dart@6a218f2413a3e78e9087f638a238f6b40893203d
         with:
           sdk: ${{ matrix.sdk }}
       - id: install
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9604b3b..abe849a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,8 @@
-## 2.0.1-dev
+## 2.0.1
 
 * Populate the pubspec `repository` field.
 * Migrate to `package:lints`.
+* Update the package's markdown badges.
 
 ## 2.0.0
 
diff --git a/README.md b/README.md
index d201004..94422ea 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,12 @@
+[![Dart CI](https://github.com/dart-lang/test_descriptor/actions/workflows/test-package.yml/badge.svg)](https://github.com/dart-lang/test_descriptor/actions/workflows/test-package.yml)
+[![pub package](https://img.shields.io/pub/v/test_descriptor.svg)](https://pub.dev/packages/test_descriptor)
+[![package publisher](https://img.shields.io/pub/publisher/test_descriptor.svg)](https://pub.dev/packages/test_descriptor/publisher)
+
 The `test_descriptor` package provides a convenient, easy-to-read API for
 defining and verifying directory structures in tests.
 
+## Usage
+
 We recommend that you import this library with the `d` prefix. The
 [`d.dir()`][dir] and [`d.file()`][file] functions are the main entrypoints. They
 define a filesystem structure that can be created using
diff --git a/pubspec.yaml b/pubspec.yaml
index 9fa3dc3..0f3836c 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: test_descriptor
-version: 2.0.1-dev
+version: 2.0.1
 description: An API for defining and verifying directory structures.
 repository: https://github.com/dart-lang/test_descriptor