Version Bump v15.1.2

bookie/src/app/app.environment.ts

@@ -1,7 +1,7 @@
 export const environment = {
   production: true,
   ACCESS_TOKEN_REFRESH_MINUTES: 10, // refresh token 10 minutes before expiry
-  version: '15.1.1',
+  version: '15.1.2',
 };
 
 export const dateFormat = {