chore: rename sit to staging

Author: Fatme

src/models/config.ts

@@ -11,7 +11,7 @@ export class Config {
 	 */
 	msvKey: string;
 	/**
-	 * Can be sit, uat or live
+	 * Can be staging, uat or live
 	 */
 	msvEnv: string;
 	callbacks: SdkCallbacks;

src/preview-app-versions.js

@@ -1,5 +1,5 @@
 const data = {
-	"sit": {
+	"staging": {
 		"playground": {
 			"android": 30,
 			"ios": 19

src/services/preview-app-versions-service.ts

@@ -5,7 +5,7 @@ export class PreviewAppVersionsService {
 	private static GET_VERSIONS_DATA_URL = "https://raw.githubusercontent.com/telerik/nativescript-preview-sdk/master/src/preview-app-versions.js?token=AAuaxiKOa83eWHeHU_N3C1qPCW1z4rv5ks5brHCBwA%3D%3D";
 
 	public validMsvKeys = ["cli", "playground"];
-	public validMsvEnvs = ["sit", "uat", "live"];
+	public validMsvEnvs = ["staging", "uat", "live"];
 
 	public async getMinSupportedVersions(key: string, env: string): Promise<{ android: number, ios: number }> {
 		const response = await this.get();