feat: change site verification settings (cotes2020#1561)

_config.yml

@@ -44,7 +44,14 @@ social:
     # - https://www.facebook.com/username
     # - https://www.linkedin.com/in/username
 
-google_site_verification: # fill in to your verification string
+# Site Verification Settings
+webmaster_verifications:
+  google: # fill in your Google verification code
+  bing: # fill in your Bing verification code
+  alexa: # fill in your Alexa verification code
+  yandex: # fill in your Yandex verification code
+  baidu: # fill in your Baidu verification code
+  facebook: # fill in your Facebook verification code
 
 # ↑ --------------------------
 # The end of `jekyll-seo-tag` settings