Minor fix

return rejected promise instead of just throw error

Author: Roy Hui

lib/logs.js

@@ -58,7 +58,7 @@ module.exports = {
 		let aliasGetAliasFunctionVersion
 		// Check if --version is specified
 		if (this._options.version) {
-			aliasGetAliasFunctionVersion = Promise.resolve(this._options.version)
+			aliasGetAliasFunctionVersion = BbPromise.resolve(this._options.version)
 		} else {
 			aliasGetAliasFunctionVersion = this.aliasGetAliasLatestFunctionVersionByFunctionName(this._alias, this._lambdaName)
 		}
@@ -126,8 +126,8 @@ module.exports = {
 
 	functionLogsShowLogs(logStreamNames) {
 		if (logStreamNames.length === 0) {
-			throw new this.serverless.classes
-				.Error('No existing streams for the latest version of function alias. If you want to view logs of a specific function version, please use --version to specify');
+			return BbPromise.reject(throw new this.serverless.classes
+				.Error('No existing streams for the latest version of function alias. If you want to view logs of a specific function version, please use --version to specify'));
 		}
 		const formatLambdaLogEvent = event => {
 			const msgParam = event.message;