More reliably find local timezone

Signed-off-by: Bob Evans <n1be@github.com>

himawaripy/himawaripy.py

@@ -12,7 +12,7 @@
 
 from PIL import Image
 from pytz import timezone
-from tzlocal import get_localzone
+from dateutil.tz import tzlocal
 
 from .config import level, output_file, auto_offset, hour_offset
 from .utils import set_background, get_desktop_environment
@@ -24,7 +24,7 @@
 
 def get_time_offset(latest_date):
     if auto_offset:
-        local_date = datetime.now(timezone(str(get_localzone())))
+        local_date = datetime.now(tzlocal())
         himawari_date = datetime.now(timezone('Australia/Sydney'))
         local_offset = local_date.strftime("%z")
         himawari_offset = himawari_date.strftime("%z")

setup.py

@@ -11,7 +11,7 @@
     description='Put near-realtime picture of Earth as your desktop background',
     long_description='himawaripy is a Python 3 script that fetches near-realtime (10 minutes delayed) picture of Earth '
                      'as its taken by Himawari 8 (ひまわり8号) and sets it as your desktop background.',
-    install_requires=["appdirs", "pillow", "python-dateutil", "pytz", "tzlocal"],
+    install_requires=["appdirs", "pillow", "python-dateutil", "pytz"],
     packages=find_packages(),
     entry_points={'console_scripts': ['himawaripy=himawaripy.himawaripy:main']},
 )