style: reduce the line width limit to 79

Author: ycexiao

.flake8

@@ -5,7 +5,7 @@ exclude =
     build,
     dist,
     doc/source/conf.py
-max-line-length = 115
+max-line-length = 79
 # Ignore some style 'errors' produced while formatting by 'black'
 # https://black.readthedocs.io/en/stable/guides/using_black_with_other_tools.html#labels-why-pycodestyle-warnings
 extend-ignore = E203

.isort.cfg

@@ -1,4 +1,4 @@
 [settings]
-line_length = 115
+line_length = 79
 multi_line_output = 3
 include_trailing_comma = True

pyproject.toml

@@ -60,7 +60,7 @@ ignore-words = ".codespell/ignore_words.txt"
 skip = "*.cif,*.dat,*agr"
 
 [tool.black]
-line-length = 115
+line-length = 79
 include = '\.pyi?$'
 exclude = '''
 /(