chore: version bump

Author: t-ho

README.md

@@ -10,7 +10,7 @@
 
 # ngx-ui-loader
 
-An all-in-one and fully customizable loader/spinner for Angular 5, 6 and 7+ applications. It supports foreground, background spinner/loader, indicative progress bar and multiple loaders.
+An all-in-one and fully customizable loader/spinner for Angular 5, 6, 7 and 8+ applications. It supports foreground, background spinner/loader, indicative progress bar and multiple loaders.
 
 [![ngx-ui-loader-demo](https://raw.githubusercontent.com/t-ho/ngx-ui-loader/master/src/assets/multi-loaders.gif)](https://ngx-ui-loader.stackblitz.io/multiloader)
 
@@ -59,6 +59,15 @@ $ yarn add ngx-ui-loader
 
 _Please read [wiki page](https://github.com/t-ho/ngx-ui-loader/wiki) for more instructions_
 
+### \* For Angular 6 and 7, please use ngx-ui-loader version 7.2.x
+
+```shell
+$ npm install --save [email protected]
+```
+
+_The documentation for **v7.2.x** is available [here](https://github.com/t-ho/ngx-ui-loader/blob/v7.x.x/README.md)_
+
+
 ### \* For Angular 4 and 5, please use ngx-ui-loader version 1.2.x
 
 ```shell