Clean up gemspec

jekyll-manager.gemspec

@@ -1,35 +1,27 @@
 # frozen_string_literal: true
 
-lib = File.expand_path("lib", __dir__)
-$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
-require "jekyll-manager/version"
+require_relative "lib/jekyll-manager/version"
 
 Gem::Specification.new do |spec|
   spec.name          = "jekyll-manager"
   spec.version       = JekyllManager::VERSION
   spec.authors       = ["Ashwin Maroli"]
   spec.email         = ["ashmaroli@gmail.com"]
-
   spec.summary       = "Jekyll Admin repackaged with some alterations"
   spec.description   = "An administrative framework for Jekyll sites, Jekyll Manager " \
                        "is essentially Jekyll Admin repackaged with some alterations."
-
   spec.homepage      = "https://github.com/ashmaroli/jekyll-manager"
   spec.license       = "MIT"
-
-  spec.metadata      = { "allowed_push_host" => "https://rubygems.org" }
-
   spec.files         = Dir.glob("lib/**/*").concat(%w(LICENSE README.md))
-  spec.bindir        = "exe"
-  spec.executables   = spec.files.grep(%r!^exe/!) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
   spec.required_ruby_version = ">= 2.5.0"
 
-  spec.add_dependency "jekyll", ">= 3.7", "< 5.0"
-  spec.add_dependency "oj", "~> 3.12"
-  spec.add_dependency "sinatra", "~> 1.4"
-  spec.add_dependency "sinatra-contrib", "~> 1.4"
+  spec.add_runtime_dependency "jekyll", ">= 3.7", "< 5.0"
+  spec.add_runtime_dependency "oj", "~> 3.12"
+  spec.add_runtime_dependency "sinatra", "~> 1.4"
+  spec.add_runtime_dependency "sinatra-contrib", "~> 1.4"
+  spec.add_runtime_dependency "webrick", "~> 1.7"
 
   spec.add_development_dependency "bundler", ">= 1.7"
   spec.add_development_dependency "gem-release", "~> 0.7"