Get SQLite error using heroku db:push when I'm using PostgreSQL as development db
heroku db:push

!    Taps Load Error: cannot load such file -- sqlite3
 !    You may need to install or update the taps gem to use db commands.
 !    On most systems this will be:
 !
 !    sudo gem install taps

development:
  adapter: postgresql
  encoding: unicode
  database: xxxx
  pool: 5
  timeout: 5000
  username: xxxx
  password: xxxx

test:
  adapter: postgresql
  encoding: unicode
  database: test
  pool: 5
  timeout: 5000
  username: xx
  password: xx

production:
  adapter: postgresql
  encoding: unicode
  database: test
  pool: 5
  timeout: 5000

heroku db:push postgres://xx:xx@localhost/xx

 !    Taps Load Error: cannot load such file -- sqlite3
 !    You may need to install or update the taps gem to use db commands.
 !    On most systems this will be:
 !
 !    sudo gem install taps

group :development do
  gem 'taps', :require => false # has an sqlite dependency, which heroku hates
end