Error running pd.show_versions()
#### Code Sample, a copy-pastable example if possible

```python
# Your code here
pd.show_versions()
```
#### Problem description
Was trying to import xlsb file...
pd.read_excel('my_file.xlsb', engine='pyxlsb')
when i received this error:
ImportError: Can't determine version for pyxlsb

Next, I tried pd.show_versions() and received the same error after restarting the kernel and running these two lines...
import pandas as pd
pd.show_versions()
ImportError: Can't determine version for pyxlsb

FYI:
Python 3.6.9 (default, Nov  7 2019, 10:44:02)
IPython 5.5.0 -- An enhanced Interactive Python.

[this should explain **why** the current behaviour is a problem and why the expected output is a better solution.]

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#### Expected Output

#### Output of ``pd.show_versions()``

<details>

[paste the output of ``pd.show_versions()`` here below this line]
In [1]: import pandas as pd

In [2]: pd.show_versions()
Traceback (most recent call last):

  File "<ipython-input-2-3d232a07e144>", line 1, in <module>
    pd.show_versions()

  File "/home/lang/.local/lib/python3.6/site-packages/pandas/util/_print_versions.py", line 97, in show_versions
    modname, raise_on_missing=False, on_version="ignore"

  File "/home/lang/.local/lib/python3.6/site-packages/pandas/compat/_optional.py", line 98, in import_optional_dependency
    version = _get_version(module)

  File "/home/lang/.local/lib/python3.6/site-packages/pandas/compat/_optional.py", line 43, in _get_version
    raise ImportError(f"Can't determine version for {module.__name__}")

ImportError: Can't determine version for pyxlsb

pd.__version__
Out[3]: '1.0.1'
</details>
