Property `illuminance` not available in pypi library

[maubuz]

Problem

The version of this library installed with pip does not includes the property illuminance from core.py.

Tested in multiple reTerminals.

Steps to reproduce it

1. Install the library as per official instructions: sudo pip3 install seeed-python-reterminal

2. Start a python shell, import the module and try to read illuminance data:

   
   import seeed_python_reterminal.core as rt
   print(rt.illuminance)

Traceback (most recent call last): File "", line 1, in AttributeError: '_Core' object has no attribute 'illuminance'

## Potential solution

The library version in pypi is 0.2, published on May 20. 2021, and matches the [version 0.2 in `setup.py`](https://github.com/Seeed-Studio/Seeed_Python_ReTerminal/blob/35e4054cb638f5661111d96e78e722fc427dbd83/setup.py#L8) of this repo.

The illuminance property and example were [added on June 15, 2021.](https://github.com/Seeed-Studio/Seeed_Python_ReTerminal/commit/460b18ebfcebf90f22948c97fdbed848862e07ff) Uploading a new version 0.3 to pypi might be necessary.

## Workaround

1. Find library installation path with `pip3 show seeed-python-reterminal`. Look for `Location: ` path.
2. Go to library installation folder and open `core.py` with CLI editor of choice (eg. nano, vim, etc).
3.  Manually add the two missing lines to `core.py`, match [code in the main branch](https://github.com/Seeed-Studio/Seeed_Python_ReTerminal/commit/460b18ebfcebf90f22948c97fdbed848862e07ff#diff-16dd83bb8fb61e5d85b51669a1b33fdb7a8e4bcb97e1a7bd6f32535d86287597).

```python
   __LIGHT_ILLUMINANCE = "/sys/bus/iio/devices/iio:device0/in_illuminance_input"

  @property
    def illuminance(self):
        return int(self.__read_1st_line_from_file(_Core.__LIGHT_ILLUMINANCE))

[matsujirushi]

Hi @maujac , Thanks for report with detail. You are right.

Ask the person in charge to release the latest code to PyPI.

[lakshanthad]

@matsujirushi @maujac It's done.

https://pypi.org/project/seeed-python-reterminal/