fix installing gems for ruby 1.9.3

Author: mpapis

Gemfile

@@ -4,7 +4,7 @@ source "https://rubygems.org"
 
 gemspec
 
-if RUBY_VERSION == "1.8.7"
+if RUBY_VERSION < "2.0.0"
   gem "capistrano", "< 3.3.0"
   gem "net-ssh",    "< 3.0.0"
   gem "i18n",       "< 0.7.0"