Fix config options typo and update readme
Hello, hope you had a merry Christmas!
While using my addition of the STARTTLS config, I noticed that there was a typo in the config parsing, that expected "tlsOption¨, singular, instead of "tlsOptions". I believe this issue was unnoticed because, until recently, the only TLS option available was not required for the program to work. This is fixed in commit 71cf2c28.
I also updated the README to include the STARTTLS option in the example configuration, to make it clear that it is supported and how to use it in commit ecfef4b3.