Add set_headers

Author: dastels

adafruit_pyportal.py

@@ -362,6 +362,13 @@ def __init__(self, *, url=None, headers=None, json_path=None, regexp_path=None,
 
         gc.collect()
 
+    def set_headers(self, headers):
+        """Set the headers used by fetch().
+
+        :param headers: The new header dictionary
+        """
+        self._headers = headers
+
     def set_background(self, file_or_color, position=None):
         """The background image to a bitmap file.