Bring in the latest Pub.

CHANGELOG.md

Index: CHANGELOG.md
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 77bec286574ff5104774149eeedc50d0ae780d52..b8721f8af98145454430012d1336da8b04ef0b8f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -52,8 +52,24 @@
 
 * Pub
 
+  * **Breaking:** various commands that previously ran `pub get` implicitly no
+    longer do so. Instead, they merely check to make sure the ".packages" file
+    is newer than the pubspec and the lock file, and fail if it's not.
+
+  * Added support for `--verbosity=error` and `--verbosity=warning`.
+
+  * `pub serve` now collapses multiple GET requests into a single line of
+    output. For full output, use `--verbose`.
+
+  * `pub deps` has improved formatting for circular dependencies on the
+    entrypoint package.
+
   * `pub run` and `pub global run`
 
+    * **Breaking:** to match the behavior of the Dart VM, executables no longer
+      run in checked mode by default. A `--checked` flag has been added to run
+      them in checked mode manually.
+
     * Faster start time for executables that don't import transformed code.
 
     * Binstubs for globally-activated executables are now written in the system