fix openCV version in readme

[atsju]

No description provided.

[github-actions]

🚀 New build available for commit c2040b8
Download installer here

[atsju]

draft as I need to check something regarding libopencv_flann4120.dll

[atsju]

I just tried the lazy method from README file on a fresh computer. relative path for DLL were not working.

[github-actions]

🚀 New build available for commit 9a1e81f
Download installer here

[gr5]

I was using the pro file "as is" and it didn't seem to need a single edit and I was hoping I could build in QT6 with this pro file unedited from within qt creator. Adding the $$PWD I think will make it so I can no longer use the pro file as is. I will try to test this out today (build the way the readme file says and then build in qt creator).

[atsju]

$$PWD expands to current .pro file location. It technically changes nothing but without it, build wasn't working today on the new computer.
This change should not affect you. It should not be required but at the same time it shouldn't harm anyone.