Fix MIME type for HTML attachment (via #187)

Author: SUNx2YCH

allure-python-commons/src/types.py

@@ -40,7 +40,7 @@ def __init__(self, mime_type, extension):
     TSV = ("text/tab-separated-values", "tsv")
     URI_LIST = ("text/uri-list", "uri")
 
-    HTML = ("application/html", "html")
+    HTML = ("text/html", "html")
     XML = ("application/xml", "xml")
     JSON = ("application/json", "json")
     YAML = ("application/yaml", "yaml")