Fix readme for running js-slang without adding to PATH

[heyzec]

Description

Following instructions on README for running the REPL without adding js-slang to PATH does not work as the command node dist/repl/repl.js quits immediately. This was due to #1672 refactored runner execution and changed the entry point to the REPL from src/repl/repl.ts to src/repl/index.ts.

This is a minor issue since anyone who follows the documentation to link js-slang to PATH using npm link will not be affected by the readme bug.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Code quality improvements

How to test

Checklist

• I have tested this code
• I have updated the documentation

[RichDom2185]

LGTM, thanks! (Sorry I forgot you use rebase instead of merge 😂)

[coveralls]

Pull Request Test Coverage Report for Build 10749362118

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 81.524%

---

Totals
Change from base Build 10688058649:	0.0%
Covered Lines:	10921
Relevant Lines:	13029

---

💛 - Coveralls