log funtion does not accept variable length arguments

[ytoml]

Describe the bug
log syntax/04_function.md

Reproducible code

Erg interpreter 0.2.8 (tags/?:, 2022/08/25 23:56:48) on aarch64/macos

>>> log "Hello"
Hello
None

>>> log "Hello", "World"
Error[#1549]: File <stdin>, line 1, in <module>
1│ log "Hello", "World"

   ^^^
TypeError: too many arguments for log:
total expected params:  1
passed positional args: 2
passed keyword args:    0

Expected behavior
Expected that it printsHello World.

[mtshiba]

Fixed in #94.