Add missing comma. (#169)

june128 · zsparal · commit 77d37bccde3f · 2018-06-29T19:34:47.000+02:00
diff --git a/book.json b/book.json
@@ -86,7 +86,7 @@
 				{
 					"lang": "racket",
 					"name": "Racket"
-				}
+				},
 				{
 					"lang": "m",
 					"name": "Matlab"
