Fix description of theme in gemspec

asciidocsy.gemspec

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 # coding: utf-8
-lib = File.expand_path("lib", __FILE__)
+lib = File.expand_path("../lib", __FILE__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require "asciidocsy/version"
 
@@ -13,12 +13,13 @@ Gem::Specification.new do |spec|
   spec.authors       = ["Brian Dominick"]
   spec.email         = ["[email protected]"]
 
-  spec.summary       = "A Jekyll theme and executable (adxy) for building tech docs."
+  spec.summary       = "A theme for building great technical documentation with Jekyll and Asciidoctor."
   spec.homepage      = "https://asciidocsy.netlify.app/docs/theme"
   spec.license       = "MIT"
 
   spec.files         = `git ls-files -z`.split("\x0").select { |f| f.match(%r!^(lib|_docs|_data|assets|_sass|LICENSE|_config\.yml|_layouts|_includes)!i) }
 
+  spec.add_runtime_dependency "jekyll", "~> 4.2"
   spec.add_runtime_dependency "jekyll-asciidoc", "~> 3.0"
   spec.add_runtime_dependency "jekyll-liquify", "=0.0.2"
   spec.add_runtime_dependency "jekyll-data", "=1.1.1"