Lines not delimited by CRLF

Problem/Motivation

Followed the instructions in the read-me to the letter and made a nice feed. Looked like it worked on my local environment, but did not load in Google calendar remote.

Tested on https://icalendar.org/validator.html and got the following error:
Lines not delimited by CRLF sequence near line # 1
Reference: RFC 5545 3.1. Content Lines

Steps to reproduce

Should be a problem on any Linux system?

Proposed resolution

Possibly run the output through something like the following:
str_replace(["\r\n", "\r", "\n"], "\r\n", $output);

Remaining tasks

User interface changes

API changes

Data model changes