chore(doc): update README (#27)

README.md

@@ -1,6 +1,6 @@
-<img src='https://github.com/WataruMaeda/react-native-boilerplate/blob/master/__DELELE_ME__/banner.svg' width='400'>
+<img src='https://github.com/WataruMaeda/react-native-boilerplate/blob/main/__DELELE_ME__/banner.svg' width='400'>
 
-<img src='https://github.com/WataruMaeda/react-native-boilerplate/blob/master/__DELELE_ME__/demo.gif' width='32%'>
+<img src='https://github.com/WataruMaeda/react-native-boilerplate/blob/main/__DELELE_ME__/demo.gif' width='32%'>
 
 - [Expo link](https://expo.io/@wataru/react-native-boilerplate)
 
@@ -18,20 +18,20 @@ We spend a large amount of time to setup a project; changing file structure, ins
 
 #### Navigation
 
-At the default, you can see 3 types of navigation; stack, tab, and drawer. Here in the [code](https://github.com/WataruMaeda/react-native-boilerplate/tree/master/src/navigator), files are separated by the navigation types. If you don't need drawer navigation for example, you can the remove drawer file and replace the import status [here](https://github.com/WataruMaeda/react-native-boilerplate/blob/master/src/navigator/Navigator.js#L7) to tab or stack navigator.
+At the default, you can see 3 types of navigation; stack, tab, and drawer. Here in the [code](https://github.com/WataruMaeda/react-native-boilerplate/tree/main/src/navigator), files are separated by the navigation types. If you don't need drawer navigation for example, you can the remove drawer file and replace the import status [here](https://github.com/WataruMaeda/react-native-boilerplate/blob/main/src/navigator/Navigator.js#L7) to tab or stack navigator.
 
 #### Authentication
 
-If your app requires authorization, you need to implement login, signup function. After the user login or logout, the navigation flow should be different. In this case, the route should be switched by the login status. In the [navigator](https://github.com/WataruMaeda/react-native-boilerplate/blob/master/src/navigator/Navigator.js#L18), you can set the different navigation changed by login status.
+If your app requires authorization, you need to implement login, signup function. After the user login or logout, the navigation flow should be different. In this case, the route should be switched by the login status. In the [navigator](https://github.com/WataruMaeda/react-native-boilerplate/blob/main/src/navigator/Navigator.js#L18), you can set the different navigation changed by login status.
 
 #### Redux
 
 We are using [Redux Toolkit](https://redux-toolkit.js.org/) to simplify the redux setup and minimize boilerplates. 
-Redux can contain global state of the app. This is very useful but on the other hand, it takes time to setup if you are not familiar with it. In the boilerplate, you see [slices file](https://github.com/WataruMaeda/react-native-boilerplate/blob/master/src/slices/app.slice.js) which contains actions and reducers in a file. Please follow the [quick start tutorials](https://redux-toolkit.js.org/tutorials/quick-start) to see how store is setup; and how to use Redux state and actions in React Components.
+Redux can contain global state of the app. This is very useful but on the other hand, it takes time to setup if you are not familiar with it. In the boilerplate, you see [slices file](https://github.com/WataruMaeda/react-native-boilerplate/blob/main/src/slices/app.slice.js) which contains actions and reducers in a file. Please follow the [quick start tutorials](https://redux-toolkit.js.org/tutorials/quick-start) to see how store is setup; and how to use Redux state and actions in React Components.
 
 #### Assets
 
-Images, icons and fonts are controlled under [theme](https://github.com/WataruMaeda/react-native-boilerplate/tree/master/src/theme). If you add new assets, you need to import the new assets in each files to access the assets from theme. Also, assets preloading is implemented as well. You can also use svg file in the boilerplate. All the assets are ready to use by importing theme.
+Images, icons and fonts are controlled under [theme](https://github.com/WataruMaeda/react-native-boilerplate/tree/main/src/theme). If you add new assets, you need to import the new assets in each files to access the assets from theme. Also, assets preloading is implemented as well. You can also use svg file in the boilerplate. All the assets are ready to use by importing theme.
 
 #### Absolute path
 
@@ -76,4 +76,4 @@ It's very important to keep code clean to maintain readability and productivity.
 
 ## Licence
 
-This project is available under the MIT license. See the [LICENSE](https://github.com/WataruMaeda/react-native-boilerplate/blob/master/LICENSE) file for more info.
+This project is available under the MIT license. See the [LICENSE](https://github.com/WataruMaeda/react-native-boilerplate/blob/main/LICENSE) file for more info.