Add profile links

CONTRIBUTORS.md

@@ -4,11 +4,11 @@
 
 ## Core contributors
 
-+ Bruce Sherwood (@BruceSherwood)
-+ Ruth Chabay (@ruthchabay)
-+ John Coady (@jcoady)
-+ Matt Craig (@mwcraig)
-+ Steve Spicklemire (@sspickle)
++ Bruce Sherwood ([@BruceSherwood](https://github.com/BruceSherwood))
++ Ruth Chabay ([@ruthchabay](https://github.com/ruthchabay))
++ John Coady ([@jcoady](https://github.com/jcoady))
++ Matt Craig ([@mwcraig](https://github.com/mwcraig))
++ Steve Spicklemire ([@sspickle](https://github.com/sspickle))
 
 ## Additional contributors
 
@@ -17,18 +17,18 @@ issues, offering improvements to the documentation or contributing code.
 
 We are certain the list is incomplete; please let one of us know by opening an [issue on GitHub](https://github.com/vpython/vpython-jupyter/issues) and we will be happy to add your name!
 
-+ Wayne Decatur (@fomightez)
-+ Tomokazu Higuchi (@higucheese)
-+ Antti Kaihola (@akaihola)
-+ Patrick Melanson (@pmelanson)
-+ Gopal Sharma (@Hippogriff)
-+ Craig C. Wiegert (@wigie)
-+ @jonschull
-+ @KHALAK
-+ @qazwsxedcrfvtg14
-+ @russkel
-+ Kyle Dunn (@kdunn926)
-+ Brian Su (@brianbbsu)
++ Wayne Decatur ([@fomightez](https://github.com/fomightez))
++ Tomokazu Higuchi ([@higucheese](https://github.com/higucheese))
++ Antti Kaihola ([@akaihola](https://github.com/akaihola))
++ Patrick Melanson ([@pmelanson](https://github.com/pmelanson))
++ Gopal Sharma ([@Hippogriff](https://github.com/Hippogriff))
++ Craig C. Wiegert ([@wigie](https://github.com/wigie))
++ [@jonschull](https://github.com/jonschull)
++ [@KHALAK](https://github.com/KHALAK)
++ [@qazwsxedcrfvtg14](https://github.com/qazwsxedcrfvtg14)
++ [@russkel](https://github.com/russkel)
++ Kyle Dunn ([@kdunn926](https://github.com/kdunn926))
++ Brian Su ([@brianbbsu](https://github.com/brianbbsu))
 + [@0dminnimda](https://github.com/0dminnimda)
 
 ## Full timeline of vpython development