2.0.6 improved error message

Author: mattqs

package.json

@@ -1,6 +1,6 @@
 {
   "name": "docker-cli-js",
-  "version": "2.0.5",
+  "version": "2.0.6",
   "description": "A node.js wrapper for the docker-machine CLI",
   "main": "dist/index.js",
   "typings": "dist/index",

src/index.ts

@@ -178,8 +178,9 @@ export class Docker {
 
         exec(execCommand, execOptions, function(error, stdout, stderr) {
           if (error) {
-            //console.error(`exec error: ${error}`);
-            return reject(stderr);
+            const message = `error: '${error}' stdout = '${stdout}' stderr = '${stderr}'`;
+            console.error(message);
+            reject(message);
           }
           //need to wrap stdout in object
           //doesn't work otherwise for 'build - t nginximg1 .'