fix italic issue with fira code

amejiarosario · amejiarosario · commit 1e1350b3c19e · 2020-08-26T14:35:27.000-04:00
diff --git a/book/config b/book/config
@@ -1 +1 @@
-Subproject commit 1216accfbd750b835ba92c196aa20ddd3414c515
+Subproject commit b4dd20d3f92beb4dd48445464e1734819a9cd40a
