Type the __init__ and util files

Author: gnikonorov

src/pytest_html/__init__.py

@@ -1,4 +1,3 @@
-# type: ignore
 try:
     from . import __version
 

src/pytest_html/util.py

@@ -1,13 +1,14 @@
-# type: ignore
 import importlib
 from functools import lru_cache
+from types import ModuleType
+from typing import Optional
 
 
 @lru_cache()
-def ansi_support():
+def ansi_support() -> Optional[ModuleType]:
     try:
         # from ansi2html import Ansi2HTMLConverter, style  # NOQA
         return importlib.import_module("ansi2html")
     except ImportError:
         # ansi2html is not installed
-        pass
+        return None