Updates DB URLs

spec/output/main_theme/vulnerable.cli_no_colour

@@ -17,7 +17,7 @@
  |
  | [!] Title: Dignitas 1.1.9 - Privilage Escalation
  |     References:
- |      - https://wpvulndb.com/vulnerabilities/7825
+ |      - https://wpscan.com/vulnerabilities/7825
  |      - http://research.evex.pw/?vuln=6
  |      - https://packetstormsecurity.com/files/130652/
  |

spec/output/vuln_api/no_token.cli_no_colour

@@ -1,2 +1,2 @@
 [!] No WPVulnDB API Token given, as a result vulnerability data has not been output.
-[!] You can get a free API token with 50 daily requests by registering at https://wpvulndb.com/users/sign_up
+[!] You can get a free API token with 50 daily requests by registering at https://wpscan.com/register

spec/output/vuln_api/no_token.json

@@ -1,5 +1,5 @@
 {
   "vuln_api": {
-    "error": "No WPVulnDB API Token given, as a result vulnerability data has not been output.\nYou can get a free API token with 50 daily requests by registering at https://wpvulndb.com/users/sign_up"
+    "error": "No WPVulnDB API Token given, as a result vulnerability data has not been output.\nYou can get a free API token with 50 daily requests by registering at https://wpscan.com/register"
   }
 }

spec/output/wp_version/with_vulns.cli_no_colour

@@ -5,12 +5,12 @@
  |
  | [!] Title: WP 3.8.1 - Vuln 1
  |     CVSS: 5.4 (VECTOR)
- |     Reference: https://wpvulndb.com/vulnerabilities/1
+ |     Reference: https://wpscan.com/vulnerabilities/1
  |
  | [!] Title: WP 3.8.1 - Vuln 2
  |     Fixed in: 3.8.2
  |     References:
- |      - https://wpvulndb.com/vulnerabilities/2
+ |      - https://wpscan.com/vulnerabilities/2
  |      - https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-0166
  |      - url-2
  |      - url-3