Release lobstr 1.0.0

[hadley]

Prepare for release:

• Wait for rlang release
• Remove remotes
• Review description
• rhub::check_for_cran()
• rhub::check(platform = "solaris-x86-patched")
• rhub::check(platform = "ubuntu-rchk")
• rlang 0.3.0 CRAN windows binary available
• devtools::check_win_devel()

Perform release:

• Bump version (in DESCRIPTION and NEWS)
• devtools::check_win_devel() (again!)
• devtools::submit_cran()
• Approve email

Wait for CRAN...

• Tag release
• Bump dev version
• Write blog post
• Tweet

Template from r-lib/usethis#338

[hadley]

Holding off on blog post until 1.0.1.