Update usps.json (#293)

usps.json

@@ -14,5 +14,7 @@
   "US postal stamps were introduced in 1847. Before that, letters were brought the post office where the postmaster would determine the postage and write it in the corner of the letter.",
   "During the construction of the Transcontinental Railroad, USPS delivered mail to the ends of the line on both sides and contracted with Wells Fargo to carry the mail between the two terminals.",
   "It is legal to mail poop. It is *illegal* to mail poop for the purpose of harassing someone.",
-  "The 1¢ stamp has never risen in price since its creation."
+  "The 1¢ stamp has never risen in price since its creation.",
+  "You can use Forever Stamps to <https://about.usps.com/postal-bulletin/2007/html/pb22218/kit1_021.html|mail anything>, just like normal stamps. When mailing anything other than first-class letters, they are valued at the current postage rate!",
+  "The USPS can deliver mail to over 180 countries. If you send letters internationally, consider buying some Global Forever stamps!"
 ]