Switch to shutil for getting terminal size

Due to possible permissions issues with automated testing switching to shutil to indirectly call os.get_terminal_size() is best.

bandcamp_dl/utils/clean_print.py

@@ -1,7 +1,7 @@
-import os
+import shutil
 
 
 def print_clean(msg):
-    terminal_size = os.get_terminal_size()
+    terminal_size = shutil.get_terminal_size()
     msg_length = len(msg)
     print("{}{}".format(msg, " " * (int(terminal_size[0]) - msg_length)), end='')

setup.py

@@ -3,7 +3,7 @@ from codecs import open
 from os import path
 import sys
 
-appversion = "0.0.8-11"
+appversion = "0.0.8-12"
 
 here = path.abspath(path.dirname(__file__))