feat(sms): add US Cellular (#1874)

docs/reference/notification.md

@@ -73,6 +73,7 @@ Default provider is Gmail. If you use a different email provider, you must provi
 | Sprint | `sprint`|
 | Telus | `telus`|
 | T-Mobile | `tmobile`|
+| USCC | `uscc`|
 | Verizon | `verizon`|
 | Virgin | `virgin`|
 | Virgin (CA) | `virgin-ca`|

src/config.ts

@@ -278,6 +278,7 @@ const notifications = {
       ['sprint', 'messaging.sprintpcs.com'],
       ['telus', 'msg.telus.com'],
       ['tmobile', 'tmomail.net'],
+      ['uscc', 'mms.uscc.net'],
       ['verizon', 'vtext.com'],
       ['virgin', 'vmobl.com'],
       ['virgin-ca', 'vmobile.ca'],