Update segmentio-integration to v5 (segment-boneyard#15)

* Update segmentio-integration to v5

* Fix cosmetic test errors

Author: Nathan Houle

package.json

@@ -18,7 +18,7 @@
     "is": "^3.1.0",
     "isodate-traverse": "^0.3.2",
     "reject": "0.0.1",
-    "segmentio-integration": "^4.0.0"
+    "segmentio-integration": "^5.0.1"
   },
   "devDependencies": {
     "istanbul": "0.x",

test/index.js

@@ -67,7 +67,7 @@ describe('Heap', function () {
       test
         .set({ appId: 'x' })
         .track(helpers.track())
-        .error('cannot POST /api/track (400)', done);
+        .error('Bad Request', done);
     });
 
     it('should convert dates into ISO string', function(done){
@@ -98,7 +98,7 @@ describe('Heap', function () {
       test
         .set({ appId: 'x' })
         .identify(helpers.identify())
-        .error('cannot POST /api/add_user_properties (400)', done);
+        .error('Bad Request', done);
     });
 
     it('should convert dates into ISO string', function(done){