update Cassandra versions and add "do not edit" comment to versions file

.cassandra-versions

@@ -1,3 +1,111 @@
+# This file is automatically generated by `rake cassandra:versions:update`
+# do not edit by hand.
+0.3.0
+0.4.0
+0.4.1
+0.4.2
+0.5.0
+0.5.1
+0.6.0
+0.6.1
+0.6.2
+0.6.3
+0.6.4
+0.6.5
+0.6.6
+0.6.7
+0.6.8
+0.6.9
+0.6.10
+0.6.11
+0.6.12
+0.6.13
+0.7.0
+0.7.1
+0.7.2
+0.7.3
+0.7.4
+0.7.5
+0.7.6
+0.7.7
+0.7.8
+0.7.9
+0.7.10
+0.8.0
+0.8.1
+0.8.2
+0.8.3
+0.8.4
+0.8.5
+0.8.6
+0.8.7
+0.8.8
+0.8.9
+0.8.10
+1.0.0
+1.0.1
+1.0.2
+1.0.3
+1.0.4
+1.0.5
+1.0.6
+1.0.7
+1.0.8
+1.0.9
+1.0.10
+1.0.11
+1.0.12
+1.1.0
+1.1.1
+1.1.2
+1.1.3
+1.1.4
+1.1.5
+1.1.6
+1.1.7
+1.1.8
+1.1.9
+1.1.10
+1.1.11
+1.1.12
+1.2.0
+1.2.1
+1.2.2
+1.2.3
+1.2.4
+1.2.5
+1.2.6
+1.2.7
+1.2.8
+1.2.9
+1.2.10
+1.2.11
+1.2.12
+1.2.13
+1.2.14
+1.2.15
+1.2.16
+1.2.17
+1.2.18
+1.2.19
+2.0.0
+2.0.1
+2.0.2
+2.0.3
+2.0.4
+2.0.5
+2.0.6
+2.0.7
+2.0.8
+2.0.9
+2.0.10
+2.0.11
+2.0.12
+2.0.13
+2.0.14
+2.0.15
+2.0.16
+2.0.17
 2.1.0
 2.1.1
 2.1.2
@@ -8,13 +116,16 @@
 2.1.7
 2.1.8
 2.1.9
-2.1.10
-2.1.11
 2.1.12
 2.1.13
 2.2.0
 2.2.1
-2.2.2
-2.2.3
 2.2.4
 2.2.5
+3.0.0
+3.0.1
+3.0.2
+3.0.3
+3.0.4
+3.1.1
+3.2.1

Rakefile

@@ -125,6 +125,8 @@ namespace :cassandra do
       listing = Net::HTTP.get(URI.parse("http://archive.apache.org/dist/cassandra/"))
       versions = listing.scan(%r(href="(\d+\.\d+\.\d+)/")).map(&:first)
       File.open(File.expand_path('../.cassandra-versions', __FILE__), 'w') do |f|
+        f.puts "# This file is automatically generated by `rake cassandra:versions:update`"
+        f.puts "# do not edit by hand."
         f.puts(versions.sort_by(&Gem::Version.method(:new)).join("\n"))
       end
     end