Update guzzle, pagerduty changes

README.md

@@ -11,10 +11,8 @@ It needs a few environment variables defined to work:
 
     PAGERDUTY_SCHEDULE_ID
     PAGERDUTY_API_TOKEN
-    PAGERDUTY_DOMAIN
 
-Those names should be fairly self-explanatory. The domain is the piece of your PagerDuty URL that is specific to you 
-i.e.  https://[PAGERDUTY_DOMAIN].pagerduty.com/
+Those names should be fairly self-explanatory.
 
 You can also optionally set PHONEDUTY_ANNOUNCE_TIME, which if set to a TRUEish value will include the current
 time of the engineer being called as part of the answering message. This may help raise awareness that you are potentially getting

app.json

@@ -14,9 +14,6 @@
     },
     "PAGERDUTY_API_TOKEN": {
       "description": "PagerDuty API token"
-    },
-    "PAGERDUTY_DOMAIN": {
-      "description": "The name of your PagerDuty a/c, as it appears in the URL"
     }
   }
 }

composer.json

@@ -21,7 +21,7 @@
     "require": {
         "php": ">=5.3.8",
         "twilio/sdk": "dev-master",
-        "guzzlehttp/guzzle": "~4.0"
+        "guzzlehttp/guzzle": "~6.0"
     },
 
     "config": {