Merge pull request #12 from SilverFire/patch-2

Added WMT currency support

Author: dercoder

Diff for: src/Message/AbstractRequest.php

@@ -251,6 +251,8 @@ public function getCurrencyByPurse($purse)
                 return 'BYR';
             case 'X':
                 return 'BTC';
+            case 'T':
+                return 'USDT';
             default:
                 return null;
         }

Diff for: tests/Message/PurchaseRequestTest.php

@@ -87,6 +87,7 @@ public function testGetCurrencyByPurse()
         $this->assertSame('UZS', $this->request->getCurrencyByPurse('Y123428476799'));
         $this->assertSame('BYR', $this->request->getCurrencyByPurse('B123428476799'));
         $this->assertSame('BTC', $this->request->getCurrencyByPurse('X123428476799'));
+        $this->assertSame('USDT', $this->request->getCurrencyByPurse('T123428476799'));
         $this->assertNull($this->request->getCurrencyByPurse('A123428476799'));
     }