Fix: badge (and markdown)

For: #84

README.md

@@ -3,20 +3,20 @@
 … or: "apt-spy for Ubuntu"
 
 [![pr](https://github.com/lagged/apt-spy2/actions/workflows/pr.yml/badge.svg)](https://github.com/lagged/apt-spy2/actions/workflows/pr.yml)
-[![Gem Version](https://badge.fury.io/rb/apt-spy2.svg)](https://badge.fury.io/rb/apt-spy2)
+![apt-spy2 (including prereleases)](https://img.shields.io/gem/v/apt-spy2?include_prereleases)
 [![Code Climate](https://codeclimate.com/github/lagged/apt-spy2.png)](https://codeclimate.com/github/lagged/apt-spy2)
 [![Coverage Status](https://coveralls.io/repos/lagged/apt-spy2/badge.png)](https://coveralls.io/r/lagged/apt-spy2)
 
 
 ## Installation
 
-```
+```sh
 gem install apt-spy2
 ```
 
 ## Usage
 
-```
+```sh
 $ apt-spy2                                                                                                                                                         [21:03:52]
 apt-spy2 commands:
   apt-spy2 check           # Evaluate mirrors
@@ -30,14 +30,14 @@ apt-spy2 commands:
 Displays a list of currently available mirrors. These mirrors are automatically selected via
 [ubuntu-mirrors](http://mirrors.ubuntu.com) using your IP's location.
 
-```
+```sh
 $ apt-spy2 list
 ...
 ```
 
 Since `mirrors.ubuntu.com` is frequently down, you can the list on [Launchpad](launchpad.net/ubuntu/+archivemirrors):
 
-```
+```sh
 $ apt-spy2 list --launchpad --country=Germany
 ...
 ```
@@ -46,7 +46,7 @@ $ apt-spy2 list --launchpad --country=Germany
 
 `check` works like `list`, but also determines if the servers returned are working. It supports the flag `--launchpad` as well and additionally a flag `--strict` which checks if a mirror carries a certain release and distribution.
 
-```
+```sh
 $ apt-spy2 check
 ...
 $ apt-spy2 check --launchpad --country=US
@@ -70,10 +70,10 @@ See `apt-spy2 help list|check|fix` for available options.
 
 ### exit codes
 
- * 0 - all went well
- * 1 - some kind of error
+* 0 - all went well
+* 1 - some kind of error
 
-### output and non-interactiveness
+### output and non-interactive behavior
 
 See `apt-spy2 help COMMAND` for more information.
 
@@ -85,6 +85,6 @@ Generally, `apt-spy2` plays especially nice in a non-interactive environment and
 
 ### Release (procedure)
 
- - update version in `lib/apt/spy2/version.rb`
- - `bundle install`
- - `git commit -a -m 'New release' && git tag -a vVERSION && git push --tags`
+* update version in `lib/apt/spy2/version.rb`
+* `bundle install`
+* `git commit -a -m 'New release' && git tag -a vVERSION && git push --tags`