Fix black linter checks - Remove u"" strings

src/escpos/escpos.py

@@ -1078,7 +1078,7 @@ class EscposIO(object):
         for line in lines:
             self.printer.set(**params)
             if isinstance(text, six.text_type):
-                self.printer.text(u"{0}\n".format(line))
+                self.printer.text("{0}\n".format(line))
             else:
                 self.printer.text("{0}\n".format(line))
 

src/escpos/magicencode.py

@@ -77,7 +77,7 @@ class Encoder(object):
             assert len(encodable_chars) == 128
             return encodable_chars
         elif "python_encode" in codepage:
-            encodable_chars = [u" "] * 128
+            encodable_chars = [" "] * 128
             for i in range(0, 128):
                 codepoint = i + 128
                 try: