chore: update gemspec so that it hopefully works for the release action

Author: bethesque

pact_broker.gemspec

@@ -6,28 +6,6 @@ require 'pact_broker/version'
 
 Gem::Specification.new do |gem|
 
-  def gem_files
-    if Dir.exist?(".git")
-      `git ls-files`.split($/)
-    else
-      root_path      = File.dirname(__FILE__)
-      all_files      = Dir.chdir(root_path) { Dir.glob("**/{*,.*}") }
-      all_files.reject! { |file| [".", ".."].include?(File.basename(file)) || File.directory?(file)}
-      gitignore_path = File.join(root_path, ".gitignore")
-      gitignore      = File.readlines(gitignore_path)
-      gitignore.map!    { |line| line.chomp.strip }
-      gitignore.reject! { |line| line.empty? || line =~ /^(#|!)/ }
-
-      all_files.reject do |file|
-        gitignore.any? do |ignore|
-          file.start_with?(ignore) ||
-            File.fnmatch(ignore, file, File::FNM_PATHNAME) ||
-            File.fnmatch(ignore, File.basename(file), File::FNM_PATHNAME)
-        end
-      end
-    end
-  end
-
   gem.name          = "pact_broker"
   gem.version       = PactBroker::VERSION
   gem.authors       = ["Bethany Skurrie", "Sergei Matheson", "Warner Godfrey"]
@@ -38,7 +16,27 @@ Gem::Specification.new do |gem|
 
   gem.required_ruby_version = '>= 2.2.0'
 
-  gem.files         = gem_files
+  gem.files         = begin
+                        if Dir.exist?(".git")
+                          `git ls-files`.split($/)
+                        else
+                          root_path      = File.dirname(__FILE__)
+                          all_files      = Dir.chdir(root_path) { Dir.glob("**/{*,.*}") }
+                          all_files.reject! { |file| [".", ".."].include?(File.basename(file)) || File.directory?(file)}
+                          gitignore_path = File.join(root_path, ".gitignore")
+                          gitignore      = File.readlines(gitignore_path)
+                          gitignore.map!    { |line| line.chomp.strip }
+                          gitignore.reject! { |line| line.empty? || line =~ /^(#|!)/ }
+
+                          all_files.reject do |file|
+                            gitignore.any? do |ignore|
+                              file.start_with?(ignore) ||
+                                File.fnmatch(ignore, file, File::FNM_PATHNAME) ||
+                                File.fnmatch(ignore, File.basename(file), File::FNM_PATHNAME)
+                            end
+                          end
+                        end
+                      end
   gem.executables   = gem.files.grep(%r{^bin/}).map{ |f| File.basename(f) }
   gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
   gem.require_paths = ["lib"]