get_timestamp_from_commit_json(), was part of Leo-Editor setup.py troubleshooting

get_timestamp_from_commit_json.py

## was part of Leo-Editor setup.py troubleshooting
try:
    import semantic_version
except ImportError:
    print('*** Warning: failed to import `semantic_version`')
    get_timestamp_from_commit_json()

def get_timestamp_from_commit_json(file):
    import json
    root = os.path.dirname(os.path.realpath(file))
    json_file = os.path.join(root, 'leo/core/commit_timestamp.json')
    with open(json_file) as json_data:
        d = json.load(json_data)
    return d['timestamp']