Incorrect JSON Schema draft URI

[iann0036]

According to the spec, the draft-07 schema URI should begin with http:// and not https:// (schema ID does not necessarily mean the network location where the resource is stored).

So I believe the references should be changed to reflect this.

[PatMyron]

looks like they were flipped here: #57

[johnttompkins]

If if remember correctly, there was some justification for the http->https changes in the references, as the library we used did not handle http 301 redirects returned by json-schema.org.

This issue json-schema-org/json-schema-org.github.io#236 seems related and was resolved around the same time as #57 . Anyways, I changed them back and it looks to be working correctly with all tests passing. Will send out a PR.