Update README.md

[f-brinkmann]

Changes proposed in this pull request:

closes #139

• Remove double line break
• Update broken link
• Use markdown links instead of bare URLs
• Make links to AES69 standard more general by removing mentions to the version (2022). This should ease maintanance

[f-brinkmann]

In case the AES search engine works, this will always link to the lates version. Currently the search engine does not work or the latest version (2022) is not available from AES.

[ahms5]

Suggested change

	AES69: *AES standard for file exchange - Spatial acoustic data file
	format*, Audio Engineering Society, Inc., New York, NY, USA. Available from the [AES standards store](
	https://aes.org/publications/standards-store/?action=standardsSearch&search=AES69&date_from=&date_to=&standards=&records=10).
	AES69: *AES standard for file exchange - Spatial acoustic data file
	format*, Audio Engineering Society, Inc., New York, NY, USA. (2022) Available from the [AES standards store](
	https://aes.org/publications/standards-store/?id=99).

I would be careful with linking to a search, this can break quickly. Therefore I would eather link the latest version or all versions. we have to adapt the reference and changes to sofar anyways. I would also link the current version (year).

[f-brinkmann]

Normally yes, but with AES its most certain that anything we do will break at some point. This links to the currently available most up to date version from the AES standards store, at least for now.

Fun fact: I did not find the current version on the AES homepage 🤷