First fixes for prompt_toolkit >= 0.37.

There are still some Unicode issues pending, but for simple usage the
prompt should be working now with the latest prompt_toolkit.

setup.py

@@ -10,7 +10,7 @@ setup(
     url = "https://github.com/bram85/topydo",
     extras_require = {
         'ical': ['icalendar'],
-        'prompt-toolkit': ['prompt-toolkit'],
+        'prompt-toolkit': ['prompt-toolkit >= 0.37'],
         'edit-cmd-tests': ['mock'],
     },
     entry_points= {

topydo/cli/Prompt.py

@@ -20,7 +20,7 @@ import sys
 
 from topydo.cli.CLIApplicationBase import CLIApplicationBase, error
 from topydo.cli.TopydoCompleter import TopydoCompleter
-from prompt_toolkit.contrib.shortcuts import get_input
+from prompt_toolkit.shortcuts import get_input
 
 from topydo.lib.Config import config, ConfigError
 
@@ -58,7 +58,7 @@ class PromptApplication(CLIApplicationBase):
 
         while True:
             try:
-                user_input = get_input('topydo> ', completer=completer).split()
+                user_input = get_input(u'topydo> ', completer=completer).split()
             except (EOFError, KeyboardInterrupt):
                 sys.exit(0)