do not truncate microseconds in DateTime.diff/3#14274

josevalim merged 3 commits intoelixir-lang:mainelixir-lang/elixir:mainfrom

tfiedlerdejanze:fix-microsecond-truncation-in-datetime-difftfiedlerdejanze/elixir:fix-microsecond-truncation-in-datetime-diffCopy head branch name to clipboard