Cleanup/modernize Gem setup

Moving the executable to ./exe, updating metadata, etc...

Author: stevenharman

.gitignore

@@ -3,7 +3,6 @@
 .ruby-version
 Gemfile.lock
 coverage
-bin/autospec
 bin/rspec
 bin/rake
 doc/

bin/git-tracker exe/git-trackerbin/git-tracker renamed to exe/git-tracker

@@ -1,4 +1,4 @@
 #!/usr/bin/env ruby
 
-require 'git_tracker'
+require "git_tracker"
 GitTracker::Runner.execute(*ARGV)

git_tracker.gemspec

@@ -5,31 +5,39 @@ Gem::Specification.new do |spec|
   spec.version = GitTracker::VERSION
   spec.authors = ["Steven Harman"]
   spec.email = ["steven@harmanly.com"]
-  spec.homepage = "https://github.com/stevenharman/git_tracker"
+
   spec.summary = "Teaching Git about Pivotal Tracker."
-  spec.description = <<-EOF
+  spec.description = <<~EOF
     Some simple tricks that make working with Pivotal Tracker even
     better... and easier... um, besier!
   EOF
+  spec.homepage = "https://github.com/stevenharman/git_tracker"
+  spec.license = "MIT"
+  spec.required_ruby_version = Gem::Requirement.new(">= 2.4.0")
 
-  spec.add_development_dependency "rspec", "~> 3.8"
+  spec.metadata = {
+    "homepage_uri" => spec.homepage,
+    "source_code_uri" => spec.homepage,
+    "bug_tracker_uri" => "#{spec.homepage}/issues",
+    "changelog_uri" => "#{spec.homepage}/blob/master/CHANGELOG.md"
+  }
+
+  # Specify which files should be added to the gem when it is released.
+  # The `git ls-files -z` loads the files in the RubyGem that have been added into git.
+  spec.files = Dir.chdir(File.expand_path("..", __FILE__)) do
+    `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
+  end
+  spec.bindir = "exe"
+  spec.executables = %w[git-tracker]
+  spec.require_paths = ["lib"]
+  spec.platform = Gem::Platform::RUBY
+
+  spec.add_development_dependency "activesupport", "~> 6.0"
   spec.add_development_dependency "pry", "~> 0.12"
   spec.add_development_dependency "rake", "~> 12.0"
+  spec.add_development_dependency "rspec", "~> 3.8"
   # Simplecov 0.18+ is currently broken for the cc-test-reporter.
   # Until it's fixed, we need to stick to something pre-0.18
   # see: https://github.com/codeclimate/test-reporter/issues/413
   spec.add_development_dependency "simplecov", "~> 0.17.0"
-
-  if RUBY_VERSION >= "2.2.2"
-    spec.add_development_dependency "activesupport", "~> 5.0"
-  else
-    spec.add_development_dependency "activesupport", "~> 4.0"
-  end
-
-  spec.files = `git ls-files`.split("\n")
-  spec.test_files = `git ls-files -- {test,spec,features}/*`.split("\n")
-  spec.executables = %w[git-tracker]
-  spec.platform = Gem::Platform::RUBY
-  spec.require_paths = ["lib"]
-  spec.required_ruby_version = ">= 2.4.0"
 end