Reduce noise in console output on test failures (#188)

index.js

@@ -65,7 +65,7 @@ module.exports = opts => {
 			done();
 		})
 			.catch(err => {
-				this.emit('error', new PluginError('gulp-mocha', err));
+				this.emit('error', new PluginError('gulp-mocha', err.code > 0 ? 'There were test failures' : err));
 				done();
 			});