Update module patrickmn/go-cache to v2

This MR contains the following updates:

Package	Type	Update	Change
github.com/patrickmn/go-cache	require	major	v0.0.0-20180815053127-5633e0862627 -> v2.1.0

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Release Notes

patrickmn/go-cache

v2.1.0

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• Add SetDefault(k string, x interface{}) for setting with the default expiration value
  • Add GetWithExpiration(k string) (interface{}, time.Time, bool) for getting both the value and expiration time (thanks Alex Edwards)
  • Fix janitor data race (thanks Vivian Mathews)

v2.0.0

Compare Source

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