Add more task dependencies

Rakefile

@@ -18,3 +18,7 @@ end
 Dir.glob("#{$REPO_ROOT}/tasks/**/*.rake").each do |task_file|
   load(task_file)
 end
+
+task 'bob' do
+  Rake::Task['bobby'].invoke if Rake::Task.task_defined?('bobby')
+end

tasks/build.rake

@@ -3,7 +3,7 @@
 require 'set'
 
 desc 'Generates the code for every service'
-task 'build' do
+task 'build' => 'require-build-tools' do
   BuildTools::Services.each do |service|
     Rake::Task["build:aws-sdk-#{service.identifier}"].invoke
   end