Fix database.yml indentation

[schneems]

Close #1250

In https://github.com/heroku/heroku-buildpack-ruby/pull/1229/files#diff-d7f6f21bc5e80a7032506dae28ef835682a02ae9d2d9d162faccf793a826f1bcR944-R950 a helper method with a block was removed. All code within the block was indented. When the block was removed the indentation was incorrectly collapsed for the config/database.yml heredoc.

Prior to Rails 4.1 Heroku would over-write any database.yml to read from DATABASE_URL https://devcenter.heroku.com/changelog-items/709.

This is running tests, and adding a changelog for #1251

[edmorley]

Could you file a ticket for adding a test in the future? (Not worth blocking this fix for now)

[schneems]

Already made an issue #1253

[schneems]

Flappy test, restarting

$ rspec ./spec/hatchet/bundler_spec.rb:44
Run options: include {:focused=>true, :locations=>{"./spec/hatchet/bundler_spec.rb"=>[44]}}
Hatchet setup: "hatchet-t-ab7e012649" for "default_ruby"
Running which -a rake on hatchet-t-ab7e012649...
Running which -a rake on hatchet-t-ab7e012649... up, run.7530 (Standard-1X)
.

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1 example, 0 failures