self.signal_features[0] and self.signal_features[-1] are never be used

[lbgitjp]

in the class TradingEnv, self.signal_features[0] and self.signal_features[-1] are never be used.

1. below code will skip self.signal_features[0]:
   

   gym-anytrading/gym_anytrading/envs/trading_env.py

   Lines 104 to 105 in 296bae4

    def _get_observation(self): 
        return self.signal_features[(self._current_tick-self.window_size+1):self._current_tick+1] 

I think it should be changed to:

def _get_observation(self):
    return self.signal_features[(self._current_tick-self.window_size):self._current_tick]

2. below code will skip self.signal_features[-1]:
   

   gym-anytrading/gym_anytrading/envs/trading_env.py

   Lines 75 to 76 in 296bae4

    if self._current_tick == self._end_tick: 
        self._done = True 

   
   I think it should be changed to:

    if self._current_tick == self._end_tick+ 1:
        self._done = True
   

thanks!