chore: migrate from react-native-dotenv to babel-plugin-dotenv-import

* Update change-guideline-sizes.md

* Update import

* Rename react-native-dotenv.js to @env.js

* Update mock

Author: meowcorp

__mocks__/react-native-dotenv.js __mocks__/@env.js

@@ -1,5 +1,5 @@
 jest.mock('react-native');
-jest.mock('react-native-dotenv');
+jest.mock('@env');
 import { scale, verticalScale, moderateScale, moderateVerticalScale } from '../extend';
 
 describe('scaling-utils when guideline sizes are set using react-native-dotenv', () => {
@@ -32,4 +32,4 @@ describe('scaling-utils when guideline sizes are set using react-native-dotenv',
         expect(Math.floor(moderateVerticalScale(100, 0.9))).toBe(100);
         expect(Math.floor(moderateVerticalScale(100, 2))).toBe(100);
     });
-});
+});

__tests__/scaling-utils.extend.spec.js

@@ -3,7 +3,7 @@
 In the ever-changing mobile devices world, screen sizes change a lot.  
 This lib uses 350dp x 680dp as guideline sizes, but if you (or your designer) prefer using different sizes it's possible.
 
-To do so, first, you'd need to setup [react-native-dotenv](https://github.com/zetachang/react-native-dotenv).  
+To do so, first, you'd need to setup [babel-plugin-dotenv-import](https://github.com/tusbar/babel-plugin-dotenv-import).  
 After setting it up and creating `.env` file, add the following env params to it:
 ```env
 SIZE_MATTERS_BASE_WIDTH=<custom-width>
@@ -12,4 +12,4 @@ SIZE_MATTERS_BASE_HEIGHT=<custom-height>
 Next and final step, you should change all your imports to `react-native-size-matters/extend`, for instance:
 ```javascript
 import { ScaledSheet, moderateScale } from 'react-native-size-matters/extend';
-```
+```

examples/change-guideline-sizes.md

@@ -1,5 +1,5 @@
 import { Dimensions } from 'react-native';
-import { SIZE_MATTERS_BASE_WIDTH, SIZE_MATTERS_BASE_HEIGHT } from 'react-native-dotenv';
+import { SIZE_MATTERS_BASE_WIDTH, SIZE_MATTERS_BASE_HEIGHT } from '@env';
 
 const { width, height } = Dimensions.get('window');
 const [shortDimension, longDimension] = width < height ? [width, height] : [height, width];
@@ -16,4 +16,4 @@ export const moderateVerticalScale = (size, factor = 0.5) => size + (verticalSca
 export const s = scale;
 export const vs = verticalScale;
 export const ms = moderateScale;
-export const mvs = moderateVerticalScale;
+export const mvs = moderateVerticalScale;