Correct README.md

[Jachimo]

README.md needs to be reviewed again.

[Jachimo]

Line 133 in README.md:

at Personal.obs (which must either not exist, or be empty, unless --force is selected).

Should be Personal (no .obs at the end)... not sure if the .obs extension on Obsidian.md vaults is really a common thing or not, so I'm just going to leave it out to avoid confusion.