add spinner fallback for Windows

The `dots` spinner doesn't work there.

Author: sindresorhus

lib/reporters/mini.js

@@ -20,7 +20,7 @@ function MiniReporter() {
 		return new MiniReporter();
 	}
 
-	var spinnerDef = spinners.dots;
+	var spinnerDef = spinners[process.platform === 'win32' ? 'line' : 'dots'];
 	this.spinnerFrames = spinnerDef.frames.map(function (c) {
 		return chalk.gray.dim(c);
 	});

test/reporters/mini.js

@@ -12,7 +12,7 @@ var compareLineOutput = require('../helper/compare-line-output');
 
 chalk.enabled = true;
 
-var graySpinner = chalk.gray.dim('⠋');
+var graySpinner = chalk.gray.dim(process.platform === 'win32' ? '-' : '⠋');
 
 // Needed because tap doesn't emulate a tty environment and thus this is
 // undefined, making `cli-truncate` append '...' to test titles