Update excon requirement from 0.70.0 to 0.112.0

Updates the requirements on [excon](https://github.com/excon/excon) to permit the latest version.
- [Changelog](https://github.com/excon/excon/blob/master/changelog.txt)
- [Commits](excon/excon@v0.70.0...v0.112.0)

---
updated-dependencies:
- dependency-name: excon
  dependency-type: direct:production
...

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

Gemfile

@@ -8,5 +8,5 @@ gem "rails", "4.0.0"
 gem "factory_girl", "4.7.0"
 gem "rubocop", "0.76.0"
 gem "rspec", "3.7.0"
-gem "excon", "0.70.0"
+gem "excon", "0.112.0"