fix: io.Copy return io.ErrShortWrite when using ansiColorWriter as destination
fix: io.Copy return io.ErrShortWrite when using ansiColorWriter as destination

See:
http://golang.org/pkg/io/#Writer
http://golang.org/src/io/io.go?s=12816:12871#L350

cmars/tools,cmars/tools,shiena/ansicolor,cmars/tools,zabawaba99/ansicolor,cmars/tools