Bump excon from 0.98.0 to 0.99.0

Bumps [excon](https://github.com/excon/excon) from 0.98.0 to 0.99.0.
- [Release notes](https://github.com/excon/excon/releases)
- [Changelog](https://github.com/excon/excon/blob/master/changelog.txt)
- [Commits](excon/excon@v0.98.0...v0.99.0)

---
updated-dependencies:
- dependency-name: excon
  dependency-type: indirect
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -10,7 +10,7 @@ GEM
     docker-api (1.34.2)
       excon (>= 0.47.0)
       multi_json
-    excon (0.98.0)
+    excon (0.99.0)
     multi_json (1.15.0)
 
 PLATFORMS