Update CHANGELOG and update typescript definitions

CHANGELOG.md

@@ -13,6 +13,7 @@
 - Add android only `getAPILevel` method (https://github.com/rebeccahughes/react-native-device-info/pull/232)
 - Add Android support for serial number, IP, and MAC address (https://github.com/rebeccahughes/react-native-device-info/pull/150)
 - Add tvOS support (https://github.com/rebeccahughes/react-native-device-info/pull/235)
+- Add flow types
 
 [Diff](https://github.com/rebeccahughes/react-native-device-info/compare/1aafc6f0b20d7cd6f0939ea5370e9899e4914c93...master)
 

deviceinfo.d.ts

@@ -23,3 +23,6 @@ export function isTablet(): boolean;
 export function isPinOrFingerprintSet(): (cb: (isPinOrFingerprintSet: boolean) => void) => void;
 export function getFirstInstallTime(): number;
 export function getLastUpdateTime(): number;
+export function getSerialNumber(): string;
+export function getIPAddress(): Promise<string>;
+export function getMACAddress(): Promise<string>;