removed quotation marks if writing keys containing equal sign and "less than" sign

[roe-dl]

If a key contains an equal sign surrounded by a "less than" and "greater than" sign, then no quotation marks are written, resulting in an unreadable file.

Example configuration file test.conf:

"x <a='b'>" = c

Example script:

import configobj
config = configobj.ConfigObj("test.conf")
config.write()

If you run the script the first time, it changes the configuration file to:

x <a='b'> = c

If you run the same script another time, an exception is raised:

Traceback (most recent call last):
  File "/home/user/configtest.py", line 3, in <module>
    config = configobj.ConfigObj("test.conf")
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/configobj/__init__.py", line 1228, in __init__
    self._load(infile, configspec)
  File "/usr/lib/python3/dist-packages/configobj/__init__.py", line 1317, in _load
    raise error
configobj.ParseError: Parse error in value at line 1.

Note that the key in this example is shortened to show the issue, but not a real world example.