Fix broken links in list of contributors

CONTRIBUTORS.rst

@@ -46,7 +46,7 @@ Listed in alphabetical order.
   Aaron Eikenberry         `@aeikenberry`_
   Adam Bogdał              `@bogdal`_
   Adam Dobrawy             `@ad-m`_
-  Adam Steele              `@adammsteele`
+  Adam Steele              `@adammsteele`_
   Agam Dua
   Alberto Sanchez          `@alb3rto`_
   Alex Tsai                `@caffodian`_
@@ -64,14 +64,14 @@ Listed in alphabetical order.
   Areski Belaid            `@areski`_
   Ashley Camba
   Barclay Gauld            `@yunti`_
-  Ben Warren               `@bwarren2`
+  Ben Warren               `@bwarren2`_
   Ben Lopatin
   Benjamin Abel
   Bert de Miranda          `@bertdemiranda`_
   Bo Lopker                `@blopker`_
   Bouke Haarsma
   Brent Payne              `@brentpayne`_               @brentpayne
-  Bartek                   `@btknu`
+  Bartek                   `@btknu`_
   Burhan Khalid            `@burhan`_                   @burhan
   Carl Johnson             `@carlmjohnson`_             @carlmjohnson
   Catherine Devlin         `@catherinedevlin`_
@@ -159,7 +159,7 @@ Listed in alphabetical order.
   Roman Afanaskin          `@siauPatrick`_
   Roman Osipenko           `@romanosipenko`_
   Russell Davies
-  Sascha                   `@saschalalala`              @saschalalala
+  Sascha                   `@saschalalala`_             @saschalalala
   Sam Collins              `@MightySCollins`_
   Shupeyko Nikita          `@webyneter`_
   Sławek Ehlert            `@slafs`_
@@ -304,6 +304,14 @@ Listed in alphabetical order.
 .. _@ahhda: https://github.com/ahhda
 .. _@keithjeb: https://github.com/keithjeb
 .. _@btknu: https://github.com/btknu
+.. _@rolep: https://github.com/rolep
+.. _@canonnervio: https://github.com/canonnervio
+.. _@jcass77: https://github.com/jcass77
+.. _@Egregors: https://github.com/Egregors
+.. _@saschalalala: https://github.com/saschalalala
+.. _@mrcoles: https://github.com/mrcoles
+.. _@ericgroom: https://github.com/ericgroom
+
 Special Thanks
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