Update changelog for BoringSSL roll

CHANGELOG.md

 ## 1.19.0
 
 ### Core library changes
 
 * `dart:io`
   * `Socket.connect` with source-address argument is now non-blocking
     on Mac. Was already non-blocking on all other platforms.
   * Report a better error when a bind fails because of a bad source address.
 
 ### Strong Mode
@@ skipping 37 matching lines @@
     ```dart
     void fn/*<T>*/(/*=T*/ object) {
       if (object is String) {
         // Treat `object` as `String` inside this block.
         // But it will require a cast to pass it to something that expects `T`.
         print(object.substring(1));
       }
     }
     ```
 
+### Dart VM
+
+*   The dependency on BoringSSL has been rolled forward. Going forward, builds
+    of the Dart VM including secure sockets will require a compiler with C11
+    support, and to link against glib 2.16 or newer.
+
 ### Tool Changes
 
 * `dartfmt` - upgraded to v0.2.9
   * Support trailing commas in argument and parameter lists.
   * Gracefully handle read-only files.
   * About a dozen other bug fixes.
 
 * Pub
   * Added the ability for packages to declare a constraint on the [Flutter][]
     SDK:
@@ skipping 1080 matching lines @@
     they will keep the Dart process alive until they time out. This fixes the
     handling of persistent connections. Previously, the client would shut down
     immediately after a request.
 
   * **Breaking change:** `HttpServer` no longer compresses all traffic by
     default. The new `autoCompress` property can be set to `true` to re-enable
     compression.
 
 * `dart:isolate`: `Isolate.spawnUri` added the optional `packageRoot` argument,
   which controls how it resolves `package:` URIs.