Remove unnecessary dependencies.

R=jmesserly@google.com

Review URL: https://codereview.chromium.org//1996553003 .

CHANGELOG.md

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 756c5bc..25fe8f8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 3.0.1
+
+* Remove unnecessary dependencies.
+
 ## 3.0.0
 
 * All deprecated APIs have been removed. No new APIs have been added. Packages

pubspec.yaml

diff --git a/pubspec.yaml b/pubspec.yaml
index c03e59d..0cf276a 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,15 +1,12 @@
 name: http_parser
-version: 3.0.1-dev
+version: 3.0.1
 author: "Dart Team <misc@dartlang.org>"
 homepage: https://github.com/dart-lang/http_parser
 description: >
   A platform-independent package for parsing and serializing HTTP formats.
 dependencies:
-  async: "^1.3.0"
   collection: ">=0.9.1 <2.0.0"
-  crypto: ">=0.9.2 <2.0.0"
   source_span: "^1.0.0"
-  stream_channel: "^1.0.0"
   string_scanner: ">=0.0.0 <0.2.0"
 dev_dependencies:
   test: "^0.12.0"