fifo-cache 0.2.0

A minimalist FIFO cache with TTL (Time To Live) support
Documentation 
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## 0.2.0
Moved TTL to a feature flag (`ttl`), which is enabled by default.  
Not sure why someone would want no TTL, but the package is named "fifo-cache", not "fifo-ttl-cache", after all.

## 0.1.1
First release.