Fix heroku_not_command for new stderr format

heroku updated its command suggestion formatting, so account for that.
For example:

    $ heroku log
     ▸    log is not a heroku command.
     ▸    Perhaps you meant logs?
     ▸    Run heroku _ to run heroku logs.
     ▸    Run heroku help for a list of available commands.
    $ fuck
    heroku logs [enter/↑/↓/ctrl+c]

thefuck/rules/heroku_not_command.py

@@ -1,19 +1,11 @@
 import re
-from thefuck.utils import replace_command, for_app
+from thefuck.utils import for_app
 
 
 @for_app('heroku')
 def match(command):
-    return 'is not a heroku command' in command.stderr and \
-           'Perhaps you meant' in command.stderr
-
-
-def _get_suggests(stderr):
-    for line in stderr.split('\n'):
-        if 'Perhaps you meant' in line:
-            return re.findall(r'`([^`]+)`', line)
+    return 'Run heroku _ to run' in command.stderr
 
 
 def get_new_command(command):
-    wrong = re.findall(r'`(\w+)` is not a heroku command', command.stderr)[0]
-    return replace_command(command, wrong, _get_suggests(command.stderr))
+    return re.findall('Run heroku _ to run ([^.]*)', command.stderr)[0]