Add FileHandler errors argument

[aminalaee]

Closes #98
This was added in Python 3.9+

Ref:
https://github.com/python/cpython/blob/f2eaa92b0cc5a37a9e6010c7c6f5ad1a230ea49b/Lib/logging/__init__.py#L1209
https://github.com/python/typeshed/blob/4c4278e80c74b10548f83236e0f56c0104bd4ed2/stdlib/logging/__init__.pyi#L828C35-L828C35

[codecov-commenter]

Codecov Report

Merging #161 (dd21c18) into main (a2842b9) will decrease coverage by 0.37%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #161      +/-   ##
==========================================
- Coverage   88.86%   88.49%   -0.37%     
==========================================
  Files          11       11              
  Lines        2146     2147       +1     
==========================================
- Hits         1907     1900       -7     
- Misses        239      247       +8     

Files	Coverage Δ
src/picologging/__init__.py	91.59% <100.00%> (+0.03%)	⬆️

... and 1 file with indirect coverage changes

[tonybaloney]

thanks @aminalaee