@context updated to W3C version (#89)

* @context uppdated.

Author: Purvanshsingh

hydra_python_core/doc_writer.py

@@ -673,8 +673,7 @@ def __init__(self, code: int, id_: str = None, title: str = "", desc: str = "")
     def generate(self, status_type: str = "Status") -> Dict[str, Any]:
         """Get as Python dict."""
         status = {
-            "@context": ("https://raw.githubusercontent.com/HydraCG/Specifications"
-                         "/master/spec/latest/core/core.jsonld"),
+            "@context": "https://www.w3.org/ns/hydra/core",
             "@type": status_type,
             "statusCode": self.code,
             "title": self.title,