Added request-url on which triggered WAF to json output file

[mikhailevtikhov]

In most cases, when processing wafw00f results, you want to see the requests that WAF triggers.

Adding the request that triggered the WAF to the output json file is implemented in this PR - vulnspace#1

Example of json output file:
[
{"url": "Target",
"detected": true,
"evil_url": "Target/?a=%3Cscript%3Ealert%28%22XSS%22%29%3B%3C%2Fscript%3E&b=UNION+SELECT+ALL+FROM+information_schema+AND+%27+or+SLEEP%285%29+or+%27&c=..%2F..%2F..%2F..%2Fetc%2Fpasswd",
"firewall": "Cloudflare",
"manufacturer": "Cloudflare Inc." }
]