correcting Brennan's name

Author: drwetter

CREDITS.md

@@ -84,7 +84,7 @@ Full contribution, see git log.
 * Hubert Kario
   - helped with avoiding accidental TCP fragmentation
 
-* Brandon Kinney
+* Brennan Kinney
   - refactored multistage Dockerfiles: performance gain+address bugs/inconsistencies
 
 * Magnus Larsen