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Account.str throws pytz.exceptions.UnknownTimeZoneError: 'CEST'

Hello!
Many public nodes have the timezone set to "CEST", which is not a real timezone, which means that when parsing the account, this exception is thrown.

Code to reproduce

from nanoblocks.node import NanoNode
from nanoblocks.network import NanoNetwork

my_address = "nano_3x3r177uxmk33hi9wk186dmhhikicbs79h78g8bmci8ghqxc7bqbg6x6a1oa"
node = NanoNode("https://mynano.ninja/api/node", "wss://ws.mynano.ninja/")
network = NanoNetwork(node)
account = network.accounts[my_address]
print(account) # The print statement throws error

Stacktrace

Traceback (most recent call last):
  File "app.py", line 13, in <module>
    print(account)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/nanoblocks/account/account.py", line 430, in __str__
    return f"{self.address} (\n\t" \
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/nanoblocks/account/account.py", line 388, in modified_date
    m_datetime = pd.to_datetime(
  File "pandas/_libs/tslibs/timestamps.pyx", line 1378, in pandas._libs.tslibs.timestamps.Timestamp.tz_convert
  File "pandas/_libs/tslibs/timestamps.pyx", line 1094, in pandas._libs.tslibs.timestamps.Timestamp.__new__
  File "pandas/_libs/tslibs/timezones.pyx", line 114, in pandas._libs.tslibs.timezones.maybe_get_tz
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/pytz/__init__.py", line 188, in timezone
    raise UnknownTimeZoneError(zone)
pytz.exceptions.UnknownTimeZoneError: 'CEST'