Use fenced code blocks in Readme.md.

Readme.md

@@ -14,24 +14,31 @@ A command line program with shortcuts for managing hosts file entries.
 
 To install with [Homebrew](http://brew.sh/):
 
+```bash
 brew tap alphabetum/taps && brew install alphabetum/taps/hosts
+```
 
 ### bpkg
 
 To install with [bpkg](http://www.bpkg.io/):
 
+```bash
 bpkg install alphabetum/hosts
+```
 
 ### Manual
 
 To install manually, simply add the `hosts` script to your `$PATH`. If
 you already have a `~/bin` directory, you can use the following command:
 
+```bash
 curl -L https://raw.github.com/alphabetum/hosts/master/hosts \
   -o ~/bin/hosts && chmod +x ~/bin/hosts
+```
 
 ## Usage
 
+```text
 Usage:
   hosts
   hosts add <ip> <hostname> [comment]
@@ -44,14 +51,19 @@ you already have a `~/bin` directory, you can use the following command:
   hosts enabled
   hosts edit
   hosts file
+```
 
 For full usage, run:
 
+```text
 hosts help
+```
 
 For help with a particular command, try:
 
+```text
 hosts help <command name>
+```
 
 ## Commands