Temporary(?) fix for #196

[raitonoberu]

This PR adds some additional parameters to the URL, so that the request returns 200. I've copied them from pytube.

The new response is slightly different.

• Video.Duration is now taken from prData.VideoDetails.LengthSeconds. I do not know why, but it is 1 second less than before, so I also changed the test.
• Video.PublishDate is missing. Pytube fetches it from the video page, so I also added a regex to fetch in parseVideoPage. get_video_info doesn't return this information anymore.

Here is the output of go test: https://pastebin.com/9wQvwbJy

You have to decide what to do with the missing values.

Thanks.

[ghost]

@raitonoberu it works for me. Thanks for the change.

For those who need this change immediately:

1. Clone raitonoberu:master
2. In your go project, run go mod edit -replace github.com/kkdai/youtube/v2=/location/for/raitonoberu:master
3. You should revert this change once the PR goes in.

[corny]

Unfortunately two tests fail.

[raitonoberu]

Yes, the tests fail because some data is missing. But this does not affect the operation of the package.
@corny, I need to consult with you as the main collaborator. Now I see 3 ways:

1. We can make an additional request (watch?v=) to get the missing fields. An inefficient method.
2. We can remove the missing fields from the Video struct. This may break backward compatibility.
3. We can simply comment out failed tests. Then the PublishDate will always be "0001-01-01 00: 00: 00 +0000 UTC".

Another way is to stop using get_video_info. This may require a lot of rewriting and possibly API changes. It is possible that adding parameters may soon stop working, that's why this PR is "temporary".

Thanks.

[ghost]

I'm able to download videos, but they don't have audio. Can anyone reproduce?

[corny]

closed in favour of #198