fix build after #1011

Author: ptrthomas

karate-core/src/test/java/com/intuit/karate/formats/postman/PostmanConverterTest.java

@@ -34,7 +34,7 @@ public void testSuccess() throws IOException {
         Assert.assertTrue(successful);
 
         // load the expected output from the resources
-        is = getClass().getResourceAsStream("expected-converted.feature");
+        is = getClass().getResourceAsStream("expected-converted.txt");
         String expectedConverted = FileUtils.toString(is);
 
         // load the actual output form the disk