Don't use relative path from spec/ to lib/

[utkarsh2102]

Hello,

Thanks for your work on in-parallel. However, I see that whilst running the tests, a require call is being made relative to the directory from spec/ to lib/:

in-parallel/spec/in_paralell_spec.rb

Line 2 in faaea5c

require_relative('../lib/in_parallel')

To know more why, refer this: https://docs.rubocop.org/rubocop-packaging/cops_packaging.html#require-relative-hardcoding-lib-rationale

Here's the patch to fix this:

Description: Fix autopkgtest.
Author: Utkarsh Gupta <utkarsh@debian.org>
Bug-Debian: https://bugs.debian.org/979700

--- a/spec/in-paralell_spec.rb
+++ b/spec/in-paralell_spec.rb
@@ -1,5 +1,6 @@
 require 'rspec'
-require_relative('../lib/in_parallel')
+require 'in_parallel'
+
 include InParallel
 TMP_FILE = Dir.mktmpdir + 'test_file.txt'
 

Should you need help, let me know!