Update CITATION.bib (#119)

The previous author list does not compile correctly in Bibtex.

Author: GiggleLiu

CITATION.bib

@@ -1,5 +1,5 @@
 @misc{Graphs2021,
-  author       = {James Fairbanks, Mathieu Besançon,  Simon Schölly, Júlio Hoffiman, Nick Eubank, and Stefan Karpinski},
+  author       = {Fairbanks, James and Besan{\c{e}}on, Mathieu and Simon, Sch{\"o}lly and Hoffiman, J{\'u}lio and Eubank, Nick and Karpinski, Stefan},
   title        = {JuliaGraphs/Graphs.jl: an optimized graphs package for the Julia programming language},
   year         = 2021,
   url = {https://github.com/JuliaGraphs/Graphs.jl/}