Apply bundler gem template recommendations

spec/crono_spec.rb

@@ -0,0 +1,7 @@
+require 'spec_helper'
+
+describe Crono do
+  it 'has a version number' do
+    expect(Crono::VERSION).not_to be nil
+  end
+end

spec/spec_helper.rb

@@ -1,6 +1,8 @@
 require 'bundler/setup'
 Bundler.setup
 
+$LOAD_PATH.unshift File.expand_path('../../lib', __FILE__)
+
 require 'timecop'
 require 'byebug'
 require 'crono'