Add changelog for v0.5.1 (#347)

Add links to new versions in README.md and doc/versions.rst.

Author: santisoler

README.md

@@ -150,6 +150,7 @@ of the **BSD 3-clause License**. A copy of this license is provided in
 - [Development](http://www.fatiando.org/harmonica/dev) (reflects the *main*
   branch on Github)
 - [Latest release](http://www.fatiando.org/harmonica/latest)
+- [v0.5.1](http://www.fatiando.org/harmonica/v0.5.1)
 - [v0.5.0](http://www.fatiando.org/harmonica/v0.5.0)
 - [v0.4.0](http://www.fatiando.org/harmonica/v0.4.0)
 - [v0.3.3](http://www.fatiando.org/harmonica/v0.3.3)

doc/changes.rst

@@ -3,12 +3,36 @@
 Changelog
 =========
 
+Version 0.5.1
+-------------
+
+*Released on: 2022/08/26*
+
+.. image:: https://zenodo.org/badge/DOI/10.5281/zenodo.7026294.svg
+   :alt: Digital Object Identifier for the Zenodo archive
+   :target: https://doi.org/10.5281/zenodo.7026294
+
+Bug fixes:
+
+- Fix test function for empty ICGEM gdf file (`#345 <https://github.com/fatiando/harmonica/pull/345>`__)
+- Add a function to ignore the tesseroid with zero density or volume (`#339 <https://github.com/fatiando/harmonica/pull/339>`__)
+- Fix equivalent sources figures in gallery examples (`#342 <https://github.com/fatiando/harmonica/pull/342>`__)
+- Replace PROJECT placeholder in changes.rst for "harmonica" (`#341 <https://github.com/fatiando/harmonica/pull/341>`__)
+
+
+This release contains contributions from:
+
+- Agustina Pesce
+- BenjMy
+- Santiago Soler
+
+
 Version 0.5.0
 -------------
 
 *Released on: 2022/08/12*
 
-.. image:: https://zenodo.org/badge/DOI/10.5281/zenodo.6987201
+.. image:: https://zenodo.org/badge/DOI/10.5281/zenodo.6987201.svg
    :alt: Digital Object Identifier for the Zenodo archive
    :target: https://doi.org/10.5281/zenodo.6987201
 

doc/versions.rst

@@ -7,6 +7,7 @@ Use the links below to access documentation for specific versions
 * `Latest release <http://www.fatiando.org/harmonica/latest>`__
 * `Development <http://www.fatiando.org/harmonica/dev>`__
   (reflects the *main* branch on GitHub)
+* `v0.5.1 <http://www.fatiando.org/harmonica/v0.5.1>`__
 * `v0.5.0 <http://www.fatiando.org/harmonica/v0.5.0>`__
 * `v0.4.0 <http://www.fatiando.org/harmonica/v0.4.0>`__
 * `v0.3.3 <http://www.fatiando.org/harmonica/v0.3.3>`__