[release] Prepare changelog for 2.0.0-dev.61.0

TBR=whesse@google.com

Change-Id: I41274ea551feea4166fd349fb6a943fdd994695d
Reviewed-on: https://dart-review.googlesource.com/59720
Reviewed-by: Alexander Thomas <athom@google.com>
diff --git a/CHANGELOG.md b/CHANGELOG.md
index adc00ff..44b7ed0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,18 @@
 
 ### Dart VM
 
+### Tool Changes
+
+#### Pub
+
+#### Other Tools
+
+### Core library changes
+
+## 2.0.0-dev.61.0
+
+### Dart VM
+
 * `async` functions now start synchronously by default.
   Passing the `--no-sync-async` flag will produce the old behavior,
   starting `async` functions asynchronously.
@@ -18,8 +30,6 @@
 
 * Fix support for running executables in Dart 2 mode.
 
-#### Other Tools
-
 ### Core library changes
 
 * `dart:io`