Reformatted dates in changelog

CHANGELOG.md

@@ -1,5 +1,6 @@
-## Version 0.7.2<br>
-## May 22, 2021
+Version 0.7.2
+==============
+**May 22, 2021**
 
 This is  a minor release with a number of bug fixes and enhancements.
 Many thanks to @StefanBrand, @loicduffar, @brl0, @michaelaye,
@@ -39,8 +40,9 @@ Documentation:
 - Switch to pydata sphinx theme ([#613](https://github.com/holoviz/hvplot/pull/613))
 - Update available options in customization docs ([#620](https://github.com/holoviz/hvplot/pull/620))
 
-## Version 0.7.1
-## March 3, 2021
+Version 0.7.1
+==============
+**March 3, 2021**
 
 Major new features:
 
@@ -58,8 +60,10 @@ Bug fixes:
 - Drop tuple NetworkX attributes to avoid errors ([#549](https://github.com/holoviz/hvplot/pull/549))
 - Cast types after applying melt to data ([#566](https://github.com/holoviz/hvplot/pull/566))
 
-## Version 0.7.0
-## November 18, 2020
+Version 0.7.0
+==============
+**November 18, 2020**
+
 Thanks to @philippjfr for managing this release and implementing most
 of the features, and to @jbednar, @ahuang11, and @AurelienSciarra for
 contributions.
@@ -84,8 +88,10 @@ Bug fixes:
 - Misc doc fixes, including to Streaming.ipynb ([#481](https://github.com/holoviz/hvplot/pull/481), [#511](https://github.com/holoviz/hvplot/pull/511))
 - Handle ``node_shape`` for networkx ([#527](https://github.com/holoviz/hvplot/pull/527))
 
-## Version 0.6.0
-## June 1, 2020
+Version 0.6.0
+==============
+**June 1, 2020**
+
 This release includes major contributions from @philippjfr (overall
 maintenance and bugfixes) and @jsignell (reference gallery), plus
 additional contributions from @slamer59 (environment), @anitagraser
@@ -121,8 +127,11 @@ Documentation:
 - Removed references to pyviz ([#373](https://github.com/holoviz/hvplot/pull/373))
 - Fix networkx documentation ([#476](https://github.com/holoviz/hvplot/pull/476))
 
-## Version 0.5.2
-## October 17, 2020
+Version 0.5.2
+==============
+
+**October 17, 2020**
+
 This release mostly includes contributions from @jsignell.
 
 - Allow tile sources to be objects as well as strings ([#345](https://github.com/holoviz/hvplot/pull/345))
@@ -131,12 +140,16 @@ This release mostly includes contributions from @jsignell.
 - Expose plot at top level, to support `pd.options.plotting.backend = 'hvplot'` ([#347](https://github.com/holoviz/hvplot/pull/347))
 - Misc bug fixes ([#341](https://github.com/holoviz/hvplot/pull/341), [#343](https://github.com/holoviz/hvplot/pull/343), [#346](https://github.com/holoviz/hvplot/pull/346))
 
-## Version 0.5.1
-## October 13, 2019
+Version 0.5.1
+==============
+**October 13, 2019**
+
 Minor release with updates to continuous integration setup (from @jsignell).
 
-## Version 0.5.0
-## October 10, 2019
+Version 0.5.0
+==============
+**October 10, 2019**
+
 This is a major release that includes bug fixes, changes to default behavior, and enhancements.
 
 Features:
@@ -148,8 +161,10 @@ Features:
  - Automatic date sorting ([#259](https://github.com/holoviz/hvplot/pull/259))
  - Allow use of strings as aggregators for datashader ([#257](https://github.com/holoviz/hvplot/pull/257))
 
-## Version 0.4.0
-## January 28, 2019
+Version 0.4.0
+==============
+**January 28, 2019**
+
 This is a major release which includes the addition of a networkx
 plotting API and a number of important bug fixes.
 
@@ -164,8 +179,10 @@ Fixes:
 - Allow setting axis position ([#149](https://github.com/holoviz/hvplot/pull/149))
 - Fixes for setting the axis positions ([#145](https://github.com/holoviz/hvplot/pull/145))
 
-## Version 0.3.0
-## January 7, 2019
+Version 0.3.0
+==============
+**January 7, 2019**
+
 This release includes a number of major improvements to the documentation and core functionality as well as a variety of bug fixes.
 
 - Added improved docstrings including all available options ([#103](https://github.com/pyviz/hvplot/pull/103), [#134](https://github.com/pyviz/hvplot/pull/134))