fixed a quote issue that was preventing key.pub from showing up in error logs

Author: Danny Diekroeger

app/admin.js

@@ -193,20 +193,20 @@ const validateKey = function(key, type) {
   if (process.config.verificationPub) {
 
       if (!key.signature) {
-          console.log('Key ${key.pub} requires a signature and does not have one.');
+          console.log(`Key ${key.pub} requires a signature and does not have one.`);
           return false;
       }
 
       let validSig = false;
       try {
           validSig = bitcoinMessage.verify(key.pub, process.config.verificationPub, key.signature);
       } catch (err) {
-          console.log('There was an error when verifying key ${key.pub}: ' + err.message);
+          console.log(`There was an error when verifying key ${key.pub}: ` + err.message);
           return false;
       }
 
       if (!validSig) {
-          console.log('Invalid signature detected on key ${key.pub}');
+          console.log(`Invalid signature detected on key ${key.pub}`);
           return false;
       }
   }