Merge pull request #5224 from jmacxx/increase_withdrawal_fee

Increase min withdrawal tx fee to 15 sats/vB

common/src/main/java/bisq/common/config/BaseCurrencyNetwork.java

@@ -73,6 +73,6 @@ public boolean isRegtest() {
     }
 
     public long getDefaultMinFeePerVbyte() {
-        return 2;
+        return 15;  // 2021-02-22 due to mempool congestion, increased from 2
     }
 }