Heroku cost optimization generic worker v1

>> We switched to Sidekiq, and nowadays we use it exclusively
Maybe reword a bit.
Suggestion:
We tried out Sidekiq, really liked it, and now use it exclusively.

Reason: saying we switched to sidekiq implies we now use it exclusively.

>> Sidekiq is heavily multithreaded.
Maybe reword this. 
2 suggstions:
Unlike Resque, Sidekiq supports multiple threads working on multiple jobs concurrently.
or
Sidekiq is multithreaded and is able to process multiple jobs concurrently.

Reason: I'm not sure anything can be "heavily" multithreaded. It either is or is not.