[Enhance] Add numba and numpy version requirements in FAQ

[xiliu8006]

Add numba and numpy version requirements in FAQ

[codecov]

Codecov Report

Merging #379 (fd65204) into master (28828ee) will increase coverage by 0.16%.
The diff coverage is n/a.

❗ Current head fd65204 differs from pull request most recent head 90f9dd9. Consider uploading reports for the commit 90f9dd9 to get more accurate results

@@            Coverage Diff             @@
##           master     #379      +/-   ##
==========================================
+ Coverage   49.55%   49.71%   +0.16%     
==========================================
  Files         177      181       +4     
  Lines       11834    12451     +617     
  Branches     1844     1951     +107     
==========================================
+ Hits         5864     6190     +326     
- Misses       5610     5871     +261     
- Partials      360      390      +30     

Flag	Coverage Δ
unittests	49.71% <ø> (+0.16%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmdet3d/datasets/sunrgbd_dataset.py	71.62% <0.00%> (-19.01%)	⬇️
mmdet3d/core/visualizer/open3d_vis.py	0.00% <0.00%> (-10.59%)	⬇️
mmdet3d/models/detectors/votenet.py	28.57% <0.00%> (-4.77%)	⬇️
mmdet3d/ops/interpolate/three_nn.py	50.00% <0.00%> (-2.64%)	⬇️
mmdet3d/ops/roiaware_pool3d/points_in_boxes.py	30.30% <0.00%> (-1.96%)	⬇️
mmdet3d/ops/knn/knn.py	32.14% <0.00%> (ø)
mmdet3d/apis/__init__.py	100.00% <0.00%> (ø)
mmdet3d/models/utils/__init__.py	100.00% <0.00%> (ø)
mmdet3d/models/detectors/__init__.py	100.00% <0.00%> (ø)
mmdet3d/core/visualizer/show_result.py	79.66% <0.00%> (ø)
... and 11 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 28828ee...90f9dd9. Read the comment docs.