(devel/R-memoise) Updated 1.1.0 to 2.0.0

# Version 2.0.0

* Memoise now uses caching objects from the cachem package by default. These caches support automatic pruning, so that they won't grow indefinitely. The older-style cache objects in the memoise package are still supported, but we suggest using new-style caches from cachem. (#112)

* Name clashes between function arguments and variables defined when memoising
  no longer occur (@egnha, #43).

* Add Google Cloud Storage support via `cache_gcs()` (@MarkEdmondson1234, #59)

* Add `compress` option for non-memory caches (@coolbutuseless, #71).

* Use absolute path in cache file system backend, so user can change working
  directory after using relative path (@xhdong-umd, #51, #65)

* Add `drop_cache()` to drop the cached result for particular arguments
  (@richardkunze, #78)

* Suppress messages of `aws.s3::head_object` within `cache_s3`'s `cache_has_key`
  to avoid printing of 404 messages for new keys (@stelsemeyer, #96).


(mef)