Merge pull request #78 from mixpanel/fix-parameter-init

Fix the inconsistency typescript definition of init

Author: zihejia

index.d.ts

@@ -2,8 +2,8 @@ type MixpanelType = any;
 type MixpanelProperties = { [key: string]: MixpanelType };
 
 export class Mixpanel {
-    static init(token: string, optInTracking?: boolean): Promise<Mixpanel>;
-    init(optInTracking?: boolean): Promise<void>;
+    static init(token: string, optOutTrackingDefault?: boolean): Promise<Mixpanel>;
+    init(optOutTrackingDefault?: boolean): Promise<void>;
     setServerURL(serverURL: string): void;
     setLoggingEnabled(loggingEnabled: boolean): void;
     setUseIpAddressForGeolocation(useIpAddressForGeolocation: boolean): void;