Fix authors list in bibliography

Author: Sarah Niemeyer

refs.bib

@@ -7,7 +7,7 @@ @misc{fowler:pairing
 },
 
 @book{forsgren2018,
-    author = {Nicole Forsgren, Jez Humble, and Gene Kim},
+    author = {Nicole Forsgren and Jez Humble and Gene Kim},
     title = {Accelerate},
     publisher = {IT Revolution Press},
     year = {2018}