Update faraday_middleware requirement from ~> 0.14 to >= 0.14, < 2.0

Updates the requirements on [faraday_middleware](https://github.com/lostisland/faraday_middleware) to permit the latest version.
- [Release notes](https://github.com/lostisland/faraday_middleware/releases)
- [Commits](lostisland/faraday_middleware@v0.14.0...v1.2.0)

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

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

elastomer-client.gemspec

@@ -23,7 +23,7 @@ Gem::Specification.new do |spec|
 
   spec.add_dependency "addressable", "~> 2.5"
   spec.add_dependency "faraday",     ">= 0.17"
-  spec.add_dependency "faraday_middleware", "~> 0.14"
+  spec.add_dependency "faraday_middleware", ">= 0.14", "< 2.0"
   spec.add_dependency "multi_json",  "~> 1.12"
   spec.add_dependency "semantic",    "~> 1.6"
 end