Switched sign for value referencing of delta to match docs

[fwitte]

Resolve #458

[pep8speaks]

Hello @fwitte! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file src/tespy/connections/connection.py:

Line 813:80: E501 line too long (100 > 79 characters)

• In the file tests/test_connections.py:

Line 90:80: E501 line too long (86 > 79 characters)
Line 119:80: E501 line too long (85 > 79 characters)

Comment last updated at 2023-12-07 18:24:24 UTC