[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

src/parameter_expansion/pe.py

@@ -82,7 +82,6 @@ def expand(s, env=None, strict=False):
             break
 
         for plain in plain_exps:
-
             expanded = "".join(expand_tokens(plain, env=env, strict=strict))
             logger_debug("expand: plain:", plain, "expanded:", expanded)
             s = s.replace(plain, expanded)
@@ -310,7 +309,6 @@ def follow_brace(shl, env, strict=False):
                     return next(shl)
                 return subst  # ""
             elif modifier.isdigit() or modifier == ":":
-
                 # This is a Substring Expansion as in ${foo:4:2}, ${foo::2},
                 # ${foo:4:} or ${foo:4:2} in the generale form of
                 # ${parameter:start:length}. No start means start=0. No length