v4.0.0

• Breaking change: Return a Hash of endpoints instead of an OpenStruct (15dc387)
• Update link-header-parser dependency to v2.0.0 (2255e6b)
• Breaking change: Update development Ruby version to 2.5.8 and minimum Ruby version to 2.5 (dd5a142)
• Refactor response headers/body parsers into a single class (ee02da3)
• Refactor IndieWeb::Endpoints::Client and remove HttpRequestService (2732616)
• Add offending url to exception message (#5) (4bf7a54)