Add password rules for bkvenergy.com

Added necessary rules for bkvenergy.com

Author: jasontenpenny

quirks/password-rules.json

@@ -167,6 +167,9 @@
     "bitly.com": {
         "password-rules": "minlength: 6; required: lower; required: upper; required: digit; required: [`!@#$%^&*()+~{}'\";:<>?]];"
     },
+    "bkvenergy.com": {
+        "password-rules": "minlength: 8; maxlength: 12; required: upper; required: lower; required: digit; required: [~!@#$%^&*()_=+,<.>- ];"
+    },
     "blackwells.co.uk": {
         "password-rules": "minlength: 8; maxlength: 30; allowed: upper,lower,digit;"
     },