Add a small changelog for 7.2

Author: jasongrout

docs/source/changelog.md

@@ -4,6 +4,29 @@ ipywidgets changelog
 A summary of changes in ipywidgets. For more detailed information, see the issues and pull requests for the appropriate milestone on [GitHub](https://github.com/jupyter-widgets/ipywidgets).
 
 
+7.2
+---
+To see the full list of pull requests and issues, see the [7.2 milestone](https://github.com/jupyter-widgets/ipywidgets/milestone/25?closed=1) on GitHub.
+
+Changes include:
+
+- Installing widgetsnbextension now automatically enables ipywidgets in Jupyter Notebook 5.3 or later. ([#1911](https://github.com/jupyter-widgets/ipywidgets/pull/1911))
+- `link` and `dlink` are now exported from ipywidgets for convenience, so that you can import them directly from ipywidgets instead of needing to import them from traitlets. ([#1923](https://github.com/jupyter-widgets/ipywidgets/pull/1923))
+- A new option `manual_name` has been added to `interact_manual()` to change the name of the update button, for example `interact_manual(manual_name='Update')`. ([#1924](https://github.com/jupyter-widgets/ipywidgets/pull/1923))
+- The Output widget now has a `.capture()` method, which returns a decorator to capture the output of a function.
+  ```python
+  from ipywidgets import Output
+  out = Output()
+
+  @out.capture()
+  def f():
+    print('This output is captured')
+  ```
+  The `.capture()` method has a `clear_output` boolean argument to automatically clear the output every time the function is run, as well as a `wait` argument corresponding to the `clear_output` wait argument. ([#1934](https://github.com/jupyter-widgets/ipywidgets/pull/1934))
+- The JavaScript base widget manager class now has a `resolveUrl` method to resolve a URL relative to the current notebook location. ([#1993](https://github.com/jupyter-widgets/ipywidgets/pull/1993))
+- The html manager now has exposes flexibility in which JavaScript file is fetched for a package and the loader used to fetch the library. ([#1995](https://github.com/jupyter-widgets/ipywidgets/pull/1995))
+- The `@jupyter-widgets/controls` widget specification version was also bumped to `1.2.0`
+
 7.1
 ---
 To see the full list of pull requests and issues, see the [7.1 milestone](https://github.com/jupyter-widgets/ipywidgets/milestone/23?closed=1) on GitHub.