Convert Canva to the more robust Response URL detection method. Add to tests to ensure that it is covered.

data.json

@@ -105,9 +105,9 @@
     "url": "https://buzzfeed.com/{}",
     "urlMain": "https://buzzfeed.com/"
   },
-  "Canva": {
+  "Canva": { 
-    "errorMsg": "Not found (404)",
+    "errorType": "response_url",
-    "errorType": "message",
+    "errorUrl": "https://www.canva.com/{}",
     "rank": 215,
     "url": "https://www.canva.com/{}",
     "urlMain": "https://www.canva.com/"

tests/all.py

@@ -112,7 +112,7 @@ class SherlockSiteCoverageTests(SherlockBaseTest):
         self.username_check(['noonewouldeverusethis7'],
                             ["Pinterest", "iMGSRC.RU", "Pastebin",
                              "WordPress", "devRant", "ImageShack", "MeetMe",
-                             "EyeEm", "CreativeMarket", "EVE Online"
+                             "EyeEm", "CreativeMarket", "EVE Online", "Canva"
                             ],
                             exist_check=False
                            )
@@ -136,7 +136,7 @@ class SherlockSiteCoverageTests(SherlockBaseTest):
         self.username_check(['blue'],
                             ["Pinterest", "iMGSRC.RU", "Pastebin",
                              "WordPress", "devRant", "ImageShack", "MeetMe",
-                             "EyeEm", "CreativeMarket", "EVE Online"
+                             "EyeEm", "CreativeMarket", "EVE Online", "Canva"
                             ],
                             exist_check=True
                            )