pkg_resources will go away

Index: src/wfuzz/helpers/file_func.py
--- src/wfuzz/helpers/file_func.py.orig
+++ src/wfuzz/helpers/file_func.py
@@ -1,7 +1,6 @@
 import os
 import sys
 import re
-import pkg_resources
 
 from chardet.universaldetector import UniversalDetector
 import chardet
@@ -10,15 +9,9 @@ from ..exception import FuzzExceptInternalError
 
 
 def get_filter_help_file():
-    FILTER_HELP_FILE = "advanced.rst"
-    FILTER_HELP_DEV_FILE = "../../../docs/user/advanced.rst"
-
-    filter_help_text = None
-    try:
-        fname = pkg_resources.resource_filename("wfuzz", FILTER_HELP_FILE)
-        filter_help_text = open(fname).read()
-    except IOError:
-        filter_help_text = open(get_path(FILTER_HELP_DEV_FILE)).read()
+    ref = importlib.resources.files('wfuzz') / 'advanced.rst'
+    with importlib.resources.as_file(ref) as path:
+        filter_help_text = open(path).read()
 
     return filter_help_text
 
