Add installation instructions using Basher

Author: Calinou

README.md

@@ -47,18 +47,24 @@ Table of contents
 Installation
 ============
 
-Linux
+Linux (manual installation)
 ```bash
 $ wget https://raw.githubusercontent.com/ekalinin/github-markdown-toc/master/gh-md-toc
 $ chmod a+x gh-md-toc
 ```
 
-OSX
+macOS (manual installation)
 ```bash
 $ curl https://raw.githubusercontent.com/ekalinin/github-markdown-toc/master/gh-md-toc -o gh-md-toc
 $ chmod a+x gh-md-toc
 ```
 
+Linux or macOS (using [Basher](https://github.com/basherpm/basher))
+```bash
+$ basher install ekalinin/github-markdown-toc
+# `gh-md-toc` will automatically be available in the PATH
+```
+
 Usage
 =====
 
@@ -153,7 +159,7 @@ Table of Contents
 That's all! Now all you need — is copy/paste result from console into original
 README.md.
 
-If you do not want to copy from console you can add `> YOURFILENAME.md` at the end of the command like `./gh-md-toc https://github.com/ekalinin/envirius/blob/master/README.md > table-of-contents.md` and this will store the table of contents to a file named table-of-contents.md in your current folder. 
+If you do not want to copy from console you can add `> YOURFILENAME.md` at the end of the command like `./gh-md-toc https://github.com/ekalinin/envirius/blob/master/README.md > table-of-contents.md` and this will store the table of contents to a file named table-of-contents.md in your current folder.
 
 And here is a result: