3.5.2

• Support Erlang/OTP-21
• ensure destination directory exists before copying data to it and fix src_dirs symlinking logic
• Display warnings when global cache dirs are read-only
• Bump cth_readable to 1.3.4 to restore eunit macro formatter functionality and lager compat
• Reload pre-started apps running in first shell boot with new sys.config
• Fix local upgrade etag handling
• Fix precedence rules of erl_opts for test profile
• Display rebar.config.script errors for better diagnosing of issues
• Handle Schema-less Proxy URLs in ENV vars
• Fix quotes handling in packages etag values
• Remove noisy debug message about internal state
• force an order on multiple profiles to fix inconsistencies on repeated runs
• use debug level for logs about bad package versioning
• don't attempt to retry finding missing packages when updating index
• Functions allowing providers and plugins to set ENV vars have been exposed
• do not return first hex package version for a constraint with no match
• Set unicode option for standard_io at entry point
• fix hooks and plugins usage when cleaning build artifacts for deps
• upgrade erlware commons and relx for various bug fixes
• Fix alias provider argument passing