ASR.fit error for import '_check_est' #84

Hello
I am trying to fit the ASR class to my EEG data with the following code
asr = ASR(sfreq=self.srate, cutoff=20, method="euclid") train_idx = np.arange(time_range[0] * self.srate, time_range[1] * self.srate, dtype=int) asr.fit(filtered_eeg[:7, train_idx])

However, it is causing the error:
cannot import name '_check_est' from 'pyriemann.utils.covariance'

After looking at covariance.py there is no command 'import _check_est' present in the newest version, so how I fixed this was installing pyRiemann 0.3 instead of 0.7 which fixed the error. I believe the requirement.txt need to be updated to prevent this error or updating the code to adapt to the new changes present in the covariance.py file