httr2 0.2.2

• curl_translate() can now handle curl copied from Chrome developer tools
  (@mgirlich, #161).

• req_oauth_*() can now refresh OAuth tokens. One, two, or even more times!
  (@jennybc, #166)

• req_oauth_device() can now work in non-interactive environments,
  as intendend (@flahn, #170)

• req_oauth_refresh() and oauth_flow_refresh() now use the envvar
  HTTR2_REFRESH_TOKEN, not HTTR_REFRESH_TOKEN (@jennybc, #169).

• req_proxy() now uses the appropriate authentication option (@jl5000).

• req_url_query() can now opt out of escaping with I() (@boshek, #152).

• Can now print responses where content type is the empty string
  (@mgirlich, #163).