docs: Fix typo SPACESHIP to SPACEFISH in README.md

[marlomgirardi]

Description

SPACEFISH_DIR_LOCK_SYMBOL was SPACESHIP_DIR_LOCK_SYMBOL in the README.

How Has This Been Tested?

• [x] I have tested using MacOS
• [ ] I have tested using Linux

Checklist:

• [x] I have checked that no other PR duplicates mine
• [x] My code follows the code style of this project.
• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [x] I have updated the tests accordingly.

[matchai]

:tada: This PR is included in version 2.5.0 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket: