Chemistry notebook failing after OpenFermion release

[balopat]

We should fix this ASAP as it blocks PR checks through the notebook tests.

This cell in docs/tutorials/educators/chemisrty.ipynb is failing:

import cirq
import openfermioncirq as ofc
import numpy as np

# Initialize qubits
qubits = cirq.LineQubit.range(n_qubits)

# Create circuit
circuit = cirq.Circuit(
    ofc.simulate_trotter(
        qubits, hamiltonian, time,
        n_steps=10,
        order=0,
        algorithm=ofc.trotter.LOW_RANK)
)

# Apply the circuit to the initial state
result = circuit.final_state_vector(initial_state)

# Compute the fidelity with the final state from exact evolution
fidelity = abs(np.dot(exact_state, result.conj()))**2

print(fidelity)

With this error

---------------------------------------------------------------------------
ModuleNotFoundError                       Traceback (most recent call last)
<ipython-input-16-0304f2d19241> in <module>
      1 import cirq
----> 2 import openfermioncirq as ofc
      3 import numpy as np
      4 
      5 # Initialize qubits

~/.virtualenvs/cirq38/lib/python3.7/site-packages/openfermioncirq/__init__.py in <module>
     32 )
     33 
---> 34 from openfermioncirq.primitives import (
     35     ffft,
     36     prepare_gaussian_state,

~/.virtualenvs/cirq38/lib/python3.7/site-packages/openfermioncirq/primitives/__init__.py in <module>
     13 """Building blocks of algorithms for quantum simulation."""
     14 
---> 15 from openfermioncirq.primitives.bogoliubov_transform import bogoliubov_transform
     16 
     17 from openfermioncirq.primitives.ffft import ffft

~/.virtualenvs/cirq38/lib/python3.7/site-packages/openfermioncirq/primitives/bogoliubov_transform.py in <module>
     20 import cirq
     21 from openfermion import slater_determinant_preparation_circuit
---> 22 from openfermion.ops._givens_rotations import (
     23         fermionic_gaussian_decomposition,
     24         givens_decomposition_square)

ModuleNotFoundError: No module named 'openfermion.ops._givens_rotations'