docs: Update AUTHORS

AUTHORS.rst

@@ -1,4 +1,11 @@
 The following individuals have contributed code, documentation, or expertise to leather:
 
 * `Christopher Groskopf <https://github.com/onyxfish/>`_
+* `Peter M. Landwehr <https://github.com/pmlandwehr>`_
+* `Ghislain Vaillant <https://github.com/ghisvail>`_
+* `Todd <https://github.com/toddrme2178>`_
+* `Loïc Corbasson <https://github.com/lcorbasson>`_
+* `Brian <https://github.com/brian-from-quantrocket>`_
 * `James McKinney <https://github.com/jpmckinney>`_
+* `Tim Gates <https://github.com/timgates42>`_
+* `Mathias <https://github.com/Math-ias>`_