Fix incorrect climate set example in README

The command requires --temp flag, not a positional argument.

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Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: cv

README.md

@@ -46,7 +46,7 @@ mcs charge stop         # Stop charging
 # Climate
 mcs climate on          # Turn on HVAC
 mcs climate off         # Turn off HVAC
-mcs climate set 21      # Set temperature (Celsius)
+mcs climate set --temp 21   # Set temperature (Celsius)
 
 # Debug
 mcs raw status          # Raw vehicle status JSON