Bump excon from 0.62.0 to 0.71.1

Bumps [excon](https://github.com/excon/excon) from 0.62.0 to 0.71.1.
- [Release notes](https://github.com/excon/excon/releases)
- [Changelog](https://github.com/excon/excon/blob/master/changelog.txt)
- [Commits](excon/excon@v0.62.0...v0.71.1)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Gemfile.lock

@@ -137,7 +137,7 @@ GEM
       launchy (~> 2.1)
       mail (~> 2.2)
     erubis (2.7.0)
-    excon (0.62.0)
+    excon (0.71.1)
     execjs (2.7.0)
     factory_girl (4.5.0)
       activesupport (>= 3.0.0)