replaced other regex checks for client version

lib/server.js

@@ -546,6 +546,14 @@ WalletService.prototype._clientSupportsBIP44 = function() {
   return true;
 };
 
+WalletService.prototype._clientSupportsTXPv2 = function() {
+  var version = this._parseClientVersion();
+  if (!version) return false;
+  if (version.agent != 'bwc') return true; // Asume 3rd party clients are up-to-date
+  if (version.major == 0 && version.minor == 0) return false;
+  return true;
+};
+
 /**
  * Joins a wallet in creation.
  * @param {Object} opts
@@ -1224,7 +1232,7 @@ WalletService.prototype.createTx = function(opts, cb) {
 
         var txp = Model.TxProposal.create(txOpts);
 
-        if (!self.clientVersion || /^bw.-0\.0\./.test(self.clientVersion)) {
+        if (!self._clientSupportsTXPv2()) {
           txp.version = '1.0.1';
         }
 
@@ -1393,7 +1401,7 @@ WalletService.prototype.signTx = function(opts, cb) {
     }, function(err, txp) {
       if (err) return cb(err);
 
-      if (!self.clientVersion || /^bw.-0\.0\./.test(self.clientVersion)) {
+      if (!self._clientSupportsTXPv2()) {
         if (!_.startsWith(txp.version, '1.')) {
           return cb(new ClientError(Errors.codes.UPGRADE_NEEDED, 'To sign this spend proposal you need to upgrade your client app.'));
         }