docs: revert css import path to ~

README.md

@@ -69,18 +69,18 @@ Don't want to use `@angular/animations`? See
 
 ```scss
 // regular style toast
-@import 'node_modules/ngx-toastr/toastr';
+@import '~ngx-toastr/toastr';
 
 // bootstrap style toast
 // or import a bootstrap 4 alert styled design (SASS ONLY)
 // should be after your bootstrap imports, it uses bs4 variables, mixins, functions
-@import 'node_modules/ngx-toastr/toastr-bs4-alert';
+@import '~ngx-toastr/toastr-bs4-alert';
 
 // if you'd like to use it without importing all of bootstrap it requires
 @import '~bootstrap/scss/functions';
 @import '~bootstrap/scss/variables';
 @import '~bootstrap/scss/mixins';
-@import 'node_modules/ngx-toastr/toastr-bs4-alert';
+@import '~ngx-toastr/toastr-bs4-alert';
 ```
 
 - If you are using angular-cli you can add it to your angular.json