change dpaste api protocol from http to https

IPython/core/magics/code.py

@@ -290,7 +290,7 b' class CodeMagics(Magics):'
         ).encode("utf-8")
 
         request = Request(
-            "http://dpaste.com/api/v2/",
+            "https://dpaste.com/api/v2/",
             headers={"User-Agent": "IPython v{}".format(version)},
         )
         response = urlopen(request, post_data)