Allow latest pkg:build_web_compilers, bump min SDK to v3 (#299)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4d7cc3e..d4470df 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,7 +14,7 @@
     strategy:
       fail-fast: false
       matrix:
-        sdk: [2.19.0, dev]
+        sdk: [3.0.0, dev]
 
     steps:
       # These are the latest versions of the github actions; dependabot will
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 152d750..f589437 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
-## 2.1.5
+## 2.1.5-dev
 
-- Require Dart 2.19
+- Require Dart 3.0
 
 ## 2.1.4
 
diff --git a/pubspec.yaml b/pubspec.yaml
index 2d71433..e50ba7c 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -4,13 +4,13 @@
 repository: https://github.com/google/vector_math.dart
 
 environment:
-  sdk: ">=2.19.0 <3.0.0"
+  sdk: ^3.0.0
 
 dev_dependencies:
   benchmark_harness: ^2.0.0
   build_runner: ^2.0.0
   build_test: ^2.0.0
-  build_web_compilers: ^3.0.0
+  build_web_compilers: ^4.0.0
   dart_flutter_team_lints: ^1.0.0
   path: ^1.8.0
   test: ^1.16.0