fix(install): verify tarball against PGP signature (#193)

feat: support $XDG_DATA_HOME if it is set (#190)

fix(install): include architecture in platform url (#188)

release: 1.5.0

build: drop Circle CI testing

refactor: drop swiftenv Docker container

feat: allow install --list on Windows

perf: use new swift.org URLs (#187)

fix: disable localization of `lscpu`. (#186)

fix: redirect 'swift --version' stderr to /dev/null (#184)

test: disallow test to use remote API calls

feat: enable version refreshing when calling list by default

feat: support caching the version list

feat: add support for getting updated version list from server

refactor: simplify platform detection