feat: add reset() to plugin (#15)

* update analytics

* clear sessionID on reset()

* fix app open session logic

Author: alanjcharles

Example/BasicExample/BasicExample.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -22,7 +22,7 @@ let package = Package(
         .package(
             name: "Segment",
             url: "https://github.com/segmentio/analytics-swift.git",
-            from: "1.4.1"
+            from: "1.5.2"
         )
     ],
     targets: [

Package.swift

@@ -66,27 +66,33 @@ public class AmplitudeSession: EventPlugin, iOSLifecycle {
             return event
         }
 
-        lastEventFiredTime = Date()
-        
         var result: T? = event
         switch result {
         case let r as IdentifyEvent:
             result = self.identify(event: r) as? T
+            lastEventFiredTime = Date()
         case let r as TrackEvent:
             result = self.track(event: r) as? T
         case let r as ScreenEvent:
             result = self.screen(event: r) as? T
+            lastEventFiredTime = Date()
         case let r as AliasEvent:
             result = self.alias(event: r) as? T
+            lastEventFiredTime = Date()
         case let r as GroupEvent:
             result = self.group(event: r) as? T
+            lastEventFiredTime = Date()
         default:
             break
         }
         return result
     }
 
     public func track(event: TrackEvent) -> TrackEvent? {
+        if event.event != "Application Opened" {
+            lastEventFiredTime = Date()
+        }
+        
         guard let returnEvent = insertSession(event: event) as? TrackEvent else {
             return nil
         }
@@ -121,6 +127,10 @@ public class AmplitudeSession: EventPlugin, iOSLifecycle {
         return returnEvent
     }
 
+    public func reset() {
+         sessionID = nil
+    }
+    
     public func applicationWillEnterForeground(application: UIApplication?) {
         if Date().timeIntervalSince(lastEventFiredTime) >= minSessionTime {
             sessionID = Date().timeIntervalSince1970