add imgflip.com mime parser

rtv/mime_parsers.py

@@ -417,6 +417,13 @@ class ImgtcMIMEParser(OpenGraphMIMEParser):
     pattern = re.compile(r'https?://(www\.)?imgtc\.com/w/[^.]+$')
 
 
+class ImgflipMIMEParser(OpenGraphMIMEParser):
+    """
+    imgflip.com uses the Open Graph protocol
+    """
+    pattern = re.compile(r'https?://(www\.)?imgflip\.com/i/[^.]+$')
+
+
 # Parsers should be listed in the order they will be checked
 parsers = [
     ClippitUserMIMEParser,
@@ -434,5 +441,6 @@ parsers = [
     GifsMIMEParser,
     GiphyMIMEParser,
     ImgtcMIMEParser,
+    ImgflipMIMEParser,
     GifvMIMEParser,
     BaseMIMEParser]