Update README.md

Update CVE main website url from cve.mitre.org to cve.org

README.md

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 cve-schema specifies the CVE JSON record format. This is the blueprint for a rich set of JSON data that can be submitted by CVE Numbering Authorities (CNAs) and Authorized Data Publishers (ADPs) to describe a CVE record. Some examples of CVE record data include CVE ID number, affected product(s), affected version(s), and public references. While those specific items are required when assigning a CVE, there are many other optional data in the schema that can be used to enrich CVE records for community benefit.
 
-Learn more about the CVE program at: https://cve.mitre.org/about/index.html
+Learn more about the CVE program at: https://www.cve.org/
 
 This CVE JSON record format is defined using JSON Schema. Learn more about JSON Schema at: https://json-schema.org/ .