Change the import to `import openfermion` (#611)
Change the import to `import openfermion` (#611)

* Change the import to `import openfermion`

* Update build_api_docs.py

* Update build_api_docs.py
kevinsung/OpenFermion,kevinsung/OpenFermion,kevinsung/OpenFermion,quantumlib/OpenFermion,quantumlib/OpenFermion,quantumlib/OpenFermion