Patch vulnerabilities: Devise and Nokogiri

[FinnWoelm]

Patches three security issues:

• https://nvd.nist.gov/vuln/detail/CVE-2019-16109
• https://github.com/plataformatec/devise/issues/4981
• https://nvd.nist.gov/vuln/detail/CVE-2019-5477

[codecov-io]

Codecov Report

Merging #351 into development will not change coverage. The diff coverage is n/a.

@@             Coverage Diff              @@
##           development     #351   +/-   ##
============================================
  Coverage        99.63%   99.63%           
============================================
  Files              135      135           
  Lines             3040     3040           
============================================
  Hits              3029     3029           
  Misses              11       11

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