Update formatador requirement from ~> 0.2 to >= 0.2, < 2.0

Updates the requirements on [formatador](https://github.com/geemus/formatador) to permit the latest version.
- [Release notes](https://github.com/geemus/formatador/releases)
- [Changelog](https://github.com/geemus/formatador/blob/master/changelog.txt)
- [Commits](geemus/formatador@v0.2.0...v1.0.0)

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

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

fog-core.gemspec

@@ -23,7 +23,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency("builder")
   spec.add_dependency("mime-types")
   spec.add_dependency("excon", "~> 0.71")
-  spec.add_dependency("formatador", "~> 0.2")
+  spec.add_dependency("formatador", ">= 0.2", "< 2.0")
 
   # https://github.com/fog/fog-core/issues/206
   # spec.add_dependency("xmlrpc") if RUBY_VERSION.to_s >= "2.4"