Add missing things to Rails 5.0 release notes [ci skip]

- https://github.com/rails/rails/pull/18288.
- https://github.com/rails/rails/commit/da9038e.
- 78dab2a856.
- https://github.com/rails/rails/pull/9065.
- https://github.com/rails/rails/pull/18314.
- https://github.com/rails/rails/pull/13434.

guides/source/5_0_release_notes.md

@@ -40,7 +40,7 @@ Major Features
 
 Action Cable is a new framework in Rails 5. It seamlessly integrates
 [WebSockets](https://en.wikipedia.org/wiki/WebSocket) with the rest of your
-Rails application. 
+Rails application.
 
 Action Cable allows for real-time features to be written in Ruby in the
 same style and form as the rest of your Rails application, while still being
@@ -220,6 +220,15 @@ Please refer to the [Changelog][railties] for detailed changes.
     ([commit](https://github.com/rails/rails/commit/b04d07337fd7bc17e88500e9d6bcd361885a45f8))
 
 
+*   Added `--skip-action-mailer` to skip Action Mailer while generating new app.
+    ([Pull Request](https://github.com/rails/rails/pull/18288))
+
+*   Removed `tmp/sessions` directory and the clear rake task associated with it.
+    ([Pull Request](https://github.com/rails/rails/pull/18314))
+
+*   Changed `_form.html.erb` generated by scaffold generator to use local variables.
+    ([Pull Request](https://github.com/rails/rails/pull/13434))
+
 Action Pack
 -----------
 
@@ -427,6 +436,9 @@ Please refer to the [Changelog][action-view] for detailed changes.
     button on submit to prevent double submits.
     ([Pull Request](https://github.com/rails/rails/pull/21135))
 
+*   Partial template name no longer has to be a valid Ruby identifier.
+    ([commit](https://github.com/rails/rails/commit/da9038e))
+
 Action Mailer
 -------------
 
@@ -521,6 +533,9 @@ Please refer to the [Changelog][active-record] for detailed changes.
 *   Removed support for PostgreSQL versions below 9.1.
     ([Pull Request](https://github.com/rails/rails/pull/23434))
 
+*   Removed support for `activerecord-deprecated_finders` gem.
+    ([commit](https://github.com/rails/rails/commit/78dab2a8569408658542e462a957ea5a35aa4679))
+
 ### Deprecations
 
 *   Deprecated passing a class as a value in a query. Users should pass strings
@@ -952,6 +967,9 @@ Please refer to the [Changelog][active-support] for detailed changes.
 *   `ActiveSupport::Duration` now supports ISO8601 formatting and parsing.
     ([Pull Request](https://github.com/rails/rails/pull/16917))
 
+*   Added ability to `TaggedLogging` to allow loggers to be instantiated multiple
+    times so that they don't share tags with each other.
+    ([Pull Request](https://github.com/rails/rails/pull/9065))
 
 Credits
 -------