# v2.5.0
- level, progname and formatter were changed to instance variable
- refactoring: disabling and enabling
- rm ./lib/tee_logger/constants.rb. Constants move to ./lib/tee_logger.rb

# v2.4.1
- update README.md
- and YARD comment

# v2.4.0
- TeeLogger#disable is allow block given

# v2.3.1
- refactoring TeeLogger#disable

# v2.3.0
- remove TeeLogger.attr_reader
  - and rename instance variable: @logger => @logfile
- implementation `#level` and `level=`
- implementation `#formatter` and `formatter=`

# v2.2.0
- disabling and enabling

# v2.1.1
- refactoring of test case
  - Introduced capture_stdout
  - Introduced FakeFS
- Change logdev of Console for Logger from STDOUT to $ stdout

# v2.1.0
- Integrate TeeLogger::Base class to TeeLogger::TeeLogger class

# v2.0.2
- bugfix

# v2.0.1
- bugfix

# v2.0.0
- Change to Class from Module

# v1.1.0
- bugfix

# v1.0.0
- first