Prepare 1.4.0 release

[gothub]

• [x] close any issues assigned to this release
• [ ] Update version number, publish date, etc. in DESCRIPTION
• [x] check that all new functions have unit tests
• [x] update NEWS
• [ ] update cran_comments
• [x] run revdepcheck::revdep_check()
  • output from revdepcheck::revdep_check():

    ── CHECK ─────────────────────────────────────────────────────────────────────────────────────────────── 1 packages ──
    ✓ dataone 2.1.4                          ── E: 0     | W: 0     | N: 0                                                
    OK: 1                                                                                                               
    BROKEN: 0
    Total time: 4 min

• [x] test with testthat 3e
• [x] rhub::check_for_cran()
  • [x] fedora-clang-devel (Fedora Linux, R-devel, clang, gfortran)
  • [x] fedora-gcc-devel (Fedora Linux, R-devel, GCC)
  • [x] macos-highsierra-release (macOS 10.13.6 High Sierra, R-release)
  • [x] macos-highsierra-release-cran (macOS 10.13.6 High Sierra, R-release, CRAN's setup)
  • [x] windows-x86_64-devel (Windows Server 2008 R2 SP1, R-devel, 32/64 bit)
  • [x] windows-x86_64-release (Windows Server 2008 R2 SP1, R-release, 32/64 bit)
• [x] devtools::check()
  • [x] macOS 10.14.6, R 4.0.2
  • [x] Ubuntu 17.10, R 3.4.4
• [x] via win-builder
  • [x] Windows: x86_64-w64-mingw32 (64-bit) R 4.0.2
  • [x] Windows: x86_64-w64-mingw32 (64-bit) R 3.6.3
  • [x] Windows: x86_64-w64-mingw32 (64-bit) R devel
• After release is posted by CRAN:
  • [x] create release tag