add conf 📞 validation and update paypal (#290)

make sure that conference_phone uses valid characters and is > 10 characters in length
switch paypal to be spec-compliant paypal.me username

Author: joshreisner

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "tsml-ui",
-  "version": "1.5.7",
+  "version": "1.5.8",
   "private": false,
   "license": "MIT",
   "scripts": {