Added comment for _read_lines()

Author: Mottl

pandas_datareader/moex.py

@@ -160,8 +160,9 @@ def _read_url_as_String(self, url, params=None):
             out = text
         return out
 
-    def _read_lines(self, out):
-        rs = read_csv(out, index_col='TRADEDATE', parse_dates=True, sep=';',
+    def _read_lines(self, input):
+        """ return pandas DataFrame from input """
+        rs = read_csv(input, index_col='TRADEDATE', parse_dates=True, sep=';',
                       na_values=('-', 'null'))
         # Get rid of unicode characters in index name.
         try: