Critical stability fix

Any projects using stale-while-revalidate features of Microcache should upgrade to v1.2.0 immediately in order to prevent potential conflicts caused by propagation of foreground request context cancellation to background revalidation requests. See #16

100% Test Coverage

Major updates

• Fixed typo in response header collapsed-fowarding -> collapsed-forwarding

Minor updates

• Fixed middleware failing to stop when monitor absent
• Altered constructor to return concrete type rather than interface
• Refactored tests for better thread safety
• Improved test coverage to 100%
• Added bench tests

Production ready

Tagging 1.0.0 now that this repository is being used in production and several initial bugs have been addressed thanks to the help of the community. 🍾

First release

v0.1

Fixing Age header