fix: remove objc leftovers causing the crash (#186)

Author: VladislavFitz

Sources/InstantSearchInsights/Logic/EventTracker.swift

@@ -13,7 +13,7 @@ import AlgoliaSearchClient
 /// Provides convenient functions for tracking events which can be used for search personalization.
 ///
 
-class EventTracker: NSObject, EventTrackable {
+class EventTracker: EventTrackable {
 
   var eventProcessor: EventProcessable
   var logger: PrefixedLogger

Sources/InstantSearchInsights/Logic/Insights.swift

@@ -30,7 +30,7 @@ import AppKit
 ///                               position: 1)
 /// ````
 
-@objcMembers public class Insights: NSObject {
+public class Insights {
 
   /// Specify the desired API endpoint region
   /// By default API endpoint is routed automatically

Tests/InstantSearchInsightsTests/Unit/InsightsTests.swift

@@ -37,8 +37,8 @@ class InsightsTests: XCTestCase {
     let insightsShared = Insights.shared(appId: appID)
     XCTAssertNotNil(insightsShared)
 
-    XCTAssertEqual(insightsRegister, insightsShared, "Getting the Insights instance from register and shared should be the same")
-    
+    XCTAssertTrue(insightsRegister === insightsShared, "Getting the Insights instance from register and shared must be the same")
+        
   }
 
   func testOptIntOptOut() {