Update ansitowin32.py for syntax warning on re string literal

Revised this fix for invalid \ sequences in literal string. Prior attempt marked the ANSI_RE as a raw string, but this suppresses the \033 code for the escape character in the literal string. Instead, escape the \d in the regular expression as \\d in the literal string.

Author: millerabel

libs/colorama/ansitowin32.py

@@ -40,7 +40,7 @@ class AnsiToWin32(object):
     sequences from the text, and if outputting to a tty, will convert them into
     win32 function calls.
     '''
-    ANSI_RE = re.compile(r'\033\[((?:\d|;)*)([a-zA-Z])')
+    ANSI_RE = re.compile('\033\[((?:\\d|;)*)([a-zA-Z])')
 
     def __init__(self, wrapped, convert=None, strip=None, autoreset=False):
         # The wrapped stream (normally sys.stdout or sys.stderr)