Update typhoeus requirement from ~> 1.3.1 to >= 1.3.1, < 1.5.0

Updates the requirements on [typhoeus](https://github.com/typhoeus/typhoeus) to permit the latest version.
- [Release notes](https://github.com/typhoeus/typhoeus/releases)
- [Changelog](https://github.com/typhoeus/typhoeus/blob/master/CHANGELOG.md)
- [Commits](typhoeus/typhoeus@v1.3.1...v1.4.0)

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

Author: dependabot-preview[bot]

sensu-plugins-http.gemspec

@@ -36,7 +36,7 @@ Gem::Specification.new do |s| # rubocop:disable Metrics/BlockLength
   s.add_runtime_dependency 'oj', '~> 3.10'
   s.add_runtime_dependency 'rest-client', '~> 2.1'
   s.add_runtime_dependency 'sensu-plugin', '~> 4.0'
-  s.add_runtime_dependency 'typhoeus', '~> 1.3.1'
+  s.add_runtime_dependency 'typhoeus', '>= 1.3.1', '< 1.5.0'
 
   s.add_development_dependency 'bundler',                   '~> 2.1'
   s.add_development_dependency 'github-markup',             '~> 3.0'