update gem to 3.0.0

Author: daattali

beautiful-jekyll-theme.gemspec

@@ -2,7 +2,7 @@
 
 Gem::Specification.new do |spec|
   spec.name          = "beautiful-jekyll-theme"
-  spec.version       = "2.3.0"
+  spec.version       = "3.0.0"
   spec.authors       = ["Dean Attali"]
   spec.email         = ["[email protected]"]