Windows: do not export Writer

[dolmen]

Do not expose symbol Writer. That symbol is purely internal and was only exported on GOOS=windows by mistake.

Currently:

$ GOOS=linux go doc .
package colorable // import "github.com/mattn/go-colorable"

func EnableColorsStdout(enabled *bool) func()
func NewColorable(file *os.File) io.Writer
func NewColorableStderr() io.Writer
func NewColorableStdout() io.Writer
func NewNonColorable(w io.Writer) io.Writer
type NonColorable struct{ ... }
$ GOOS=windows go doc .
package colorable // import "github.com/mattn/go-colorable"

func EnableColorsStdout(enabled *bool) func()
func NewColorable(file *os.File) io.Writer
func NewColorableStderr() io.Writer
func NewColorableStdout() io.Writer
func NewNonColorable(w io.Writer) io.Writer
type NonColorable struct{ ... }
type Writer struct{ ... }

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +77.00 🎉

Comparison is base (11a925c) 6.33% compared to head (8e4a944) 83.33%.

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Additional details and impacted files

@@             Coverage Diff             @@
##           master      #68       +/-   ##
===========================================
+ Coverage    6.33%   83.33%   +77.00%     
===========================================
  Files           3        2        -1     
  Lines         600       42      -558     
===========================================
- Hits           38       35        -3     
+ Misses        561        6      -555     
  Partials        1        1               

see 1 file with indirect coverage changes

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[mattn]

Thank you