Add Reinis as co-author

Author: james-d-mitchell

docs/source/authors.rst

@@ -10,6 +10,7 @@
 Authors
 =======
 
+- `Reinis Cirpons`_ (rc234@st-andrews.ac.uk)_
 - `Joseph Edwards`_ (jde1@st-andrews.ac.uk)
 - `James Mitchell`_ (jdm3@st-andrews.ac.uk)
 - `Maria Tsalakou`_ (mt200@st-andrews.ac.uk)
@@ -21,6 +22,8 @@ Authors
 
 .. _maria tsalakou: https://mariatsalakou.github.io/
 
+.. _reinis cirpons: https://reinisc.id.lv
+
 Contributors
 ------------