fix(metrics): Add an entry to EVENT_PROPERTIES for `notify` group.

I missed this yesterday.

metrics/amplitude.js

@@ -44,6 +44,7 @@ const EVENT_PROPERTIES = {
   [GROUPS.email]: mapEmailType,
   [GROUPS.emailFirst]: NOP,
   [GROUPS.login]: NOP,
+  [GROUPS.notify]: NOP,
   [GROUPS.registration]: NOP,
   [GROUPS.settings]: mapDisconnectReason,
   [GROUPS.sms]: NOP
@@ -93,6 +94,7 @@ function mapDisconnectReason (eventType, eventCategory) {
 }
 
 module.exports = {
+  EVENT_PROPERTIES,
   GROUPS,
 
   /**

test/metrics/amplitude.js

@@ -30,6 +30,13 @@ describe('metrics/amplitude:', () => {
     assert.isString(amplitude.GROUPS.sms);
   });
 
+  it('has an EVENT_PROPERTIES entry for each group', () => {
+    for (const group of Object.keys(amplitude.GROUPS)) {
+      const groupName = amplitude.GROUPS[group];
+      assert.isFunction(amplitude.EVENT_PROPERTIES[groupName], group);
+    }
+  });
+
   it('exports an initialize method', () => {
     assert.isFunction(amplitude.initialize);
     assert.lengthOf(amplitude.initialize, 3);