Rename --show-time-today to --today

tests/samples/output/common_usage_header

@@ -10,4 +10,4 @@ usage: wakatime [-h] [--entity FILE] [--key KEY] [--write] [--plugin PLUGIN]
                 [--include-only-with-project-file] [--extra-heartbeats]
                 [--log-file LOG_FILE] [--api-url API_URL] [--timeout TIMEOUT]
                 [--sync-offline-activity SYNC_OFFLINE_ACTIVITY]
-                [--show-time-today] [--config CONFIG] [--verbose] [--version]
+                [--today] [--config CONFIG] [--verbose] [--version]

tests/samples/output/test_help_contents

@@ -76,7 +76,7 @@ optional arguments:
                         sent while online 5 offline heartbeats are synced. Can
                         be used without --entity to only sync offline activity
                         without generating new heartbeats.
-  --show-time-today     Prints dashboard time for Today, then exits.
+  --today               Prints dashboard time for Today, then exits.
   --config CONFIG       Defaults to ~/.wakatime.cfg.
   --verbose             Turns on debug messages in log file.
   --version             show program's version number and exit

tests/test_arguments.py

@@ -329,7 +329,7 @@ class ArgumentsTestCase(TestCase):
         self.patched['wakatime.packages.requests.adapters.HTTPAdapter.send'].return_value = SummaryResponse()
 
         config = 'tests/samples/configs/good_config.cfg'
-        args = ['--config', config, '--show-time-today', '--verbose']
+        args = ['--config', config, '--today', '--verbose']
 
         retval = execute(args)