Merge pull request #1628 from plotly/dependabot/bundler/excon-0.71.0

Bump excon from 0.67.0 to 0.71.0

Author: Joseph Damiba

Gemfile.lock

@@ -45,7 +45,7 @@ GEM
  eventmachine (1.2.7)
  eventmachine (1.2.7-x64-mingw32)
  eventmachine (1.2.7-x86-mingw32)
- excon (0.67.0)
+ excon (0.71.0)
  execjs (2.7.0)
  faraday (0.15.3)
  multipart-post (>= 1.2, < 3)