actionkv1 position for insert

[jflasche]

Hi Tim,

in code/ch7/ch7-actionkv1/src/lib.rs line 196..=198:
let next_byte = SeekFrom::End(0);
let current_position = f.seek(SeekFrom::Current(0))?;
f.seek(next_byte)?;

current_position does not necessarily reflects the end of the file, but a new record should always go to the end.

so, shouldn't it be just simple a one line:
let current_position = f.seek(SeekFrom::End(0))?;

Thanks for clarification
Jens