From d833e37975cdfa07bf797c785cd7998c66cfc45d Mon Sep 17 00:00:00 2001
From: Jeniamakarchik <eniamak@gmail.com>
Date: Thu, 7 May 2020 15:27:10 +0300
Subject: [PATCH] add processing 4th level for book structure

---
 src/book.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/book.py b/src/book.py
index 74a0c37..0549089 100644
--- a/src/book.py
+++ b/src/book.py
@@ -29,8 +29,8 @@ class Book:
         "Verdana": "verdana,geneva,sans-serif"
     }
 
-    SUPPORTED_LEVELS = 3
-    SUPPORTED_HEADERS = {"h1", "h2", "h3"}
+    SUPPORTED_LEVELS = 4
+    SUPPORTED_HEADERS = {"h1", "h2", "h3", "h4"}
     HEADERS_LEVELS = {"h1", "h2", "h3", "h4", "h5", "h6", "h7", "h8", "h9"}