fix: corrected content-type header check.

content type can be both `application/json` and
`application/graphql-response-json` for example, so we simply
check for the phrase `json` in the content-type header

Author: ardevd

dimo/request.py

@@ -51,7 +51,7 @@ def __call__(self, headers=None, data=None, params=None, **kwargs):
             raise HTTPError(status=status or -1, message=str(exc), body=body)
 
         content_type = response.headers.get("Content-Type", "")
-        if "application/json" in content_type:
+        if "json" in content_type:
             return response.json()
 
         return response.content