Use the Classname::VERSION pattern

Instead of having a hardcoded version identifier in multiple
locations, we can leverage the Classname::VERSION pattern to have a
single canonical version number that everything can reference
programmatically.

lib/vmfloaty.rb

@@ -16,7 +16,7 @@ class Vmfloaty
   include Commander::Methods
 
   def run
-    program :version, Version.get
+    program :version, Vmfloaty::VERSION
     program :description, 'A CLI helper tool for Puppet Labs vmpooler to help you stay afloat'
 
     config = Conf.read_config

lib/vmfloaty/version.rb

@@ -1,8 +1,3 @@
-
-class Version
-  @version = '0.7.8'
-
-  def self.get
-    @version
-  end
+class Vmfloaty
+  VERSION = '0.7.8'.freeze
 end

vmfloaty.gemspec

@@ -1,6 +1,9 @@
+$LOAD_PATH.push File.expand_path('../lib', __FILE__)
+require 'vmfloaty/version'
+
 Gem::Specification.new do |s|
   s.name = 'vmfloaty'
-  s.version = '0.7.8'
+  s.version = Vmfloaty::VERSION
   s.authors = ['Brian Cain']
   s.email = ['brian.cain@puppetlabs.com']
   s.license = 'Apache-2.0'