adds troubleshooting to spanner README (GoogleCloudPlatform#417)

Author: bshaffer

monitoring/test/monitoringTest.php

@@ -51,7 +51,7 @@ public function testCreateMetric()
                 'metric_id' => self::$metricId,
             ]);
             $this->assertContains(self::$metricId, $output);
-        });
+        }, 10);
     }
 
     /** @depends testCreateMetric */

spanner/README.md

@@ -93,6 +93,14 @@ To run the Spanner Samples:
       update-data                   Updates sample data in the database.
 
 
+## Troubleshooting
+
+If you get the following error, set the environment variable `GCLOUD_PROJECT` to your project ID:
+
+```
+[Google\Cloud\Core\Exception\GoogleException]
+No project ID was provided, and we were unable to detect a default project ID.
+```
 
 ## The client library
 

spanner/composer.json

@@ -1,6 +1,6 @@
 {
   "require": {
-    "google/cloud-spanner": "^0.2.2",
+    "google/cloud-spanner": "^0.4",
     "symfony/console": "^3.2"
   },
   "require-dev": {