update README and test for get USS file in ASCII_NO_TRAILING_BLANKS mode

Signed-off-by: Tian Na <[email protected]>

README.md

@@ -400,7 +400,7 @@ await connection.uploadFile(input, '/u/username/hosts');
 ##### Parameter
 
 * filePath - _string_ -  USS file path name.
-* transferMode - _TransferMode_ -  `TransferMode.ASCII`, `TransferMode.BINARY`. When downloading a text dataset, transferMode should be either `TransferMode.ASCII` so that z/OS FTP service converts `EBCDIC` characters to  `ASCII`.
+* transferMode - _TransferMode_ -  `TransferMode.ASCII`, `TransferMode.BINARY` and `TransferMode.ASCII_NO_TRAILING_BLANKS`. The `TransferMode.ASCII` and `TransferMode.ASCII_NO_TRAILING_BLANKS` asks z/OS FTP service to convert `EBCDIC` characters to  `ASCII`. The `TransferMode.ASCII_NO_TRAILING_BLANKS` asks z/OS FTP service to remove trailing blanks.
 * stream - _boolean_ -  `true` if you want to obtain a [ReadableStream](https://nodejs.org/api/stream.html#stream_readable_streams) of the file content, or `false` to read a full file into memory (in Buffer). The buffer accepts up to 4MB data. For large file, use `stream=true` instead.
 
 ##### Return

src/__test__/downloadFile.test.ts

@@ -56,8 +56,8 @@ describe('The method of downloadFile()', () => {
         expect(buffer.toString()).toBe(text);
     });
 
-    it('can get USS file in ASCII_NO_TRAILING_BLANKS mode', async () => {
-        const text = 'Hello';
+    it.only('can get USS file in ASCII_NO_TRAILING_BLANKS mode', async () => {
+        const text = 'Hello\r\n';
 
         const buffer = await accessor.downloadFile(getUSSPath('nodeacc/hello_with_trailingblanks.txt'), TransferMode.ASCII_NO_TRAILING_BLANKS);
         expect(buffer.toString()).toBe(text);