remotes 2.0.1

install_github() now bundles a GitHub PAT which is used on Travis to avoid
hitting the rate limit too frequently. It also contains a more informative
error message when the rate limit is hit on how to setup a GitHub personal
access token.
The dialog when upgrade = "ask" now has a 'CRAN only' option, to update
only CRAN packages.
No longer include project specific .Rprofile code in the temporary .Rprofile when
R_REMOTES_NO_ERRORS_FROM_WARNINGS=false (the default).
update.package_deps() no longer prompts to install uninstalled
dependencies, they are always installed (#203).
available_packages(), available_packages_set() and
available_packges_reset() added to allow caching of the
available.packages() database.

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