Better syntax highlighting in readme

Readme.md

@@ -4,7 +4,7 @@ Runs as a [Dockerfile deployment](http://dokku.viewdocs.io/dokku/deployment/meth
 
 ## Setup
 
-```
+```bash
 dokku plugin:install https://github.com/dokku/dokku-postgres.git
 
 dokku apps:create ttrss
@@ -22,7 +22,7 @@ dokku run ttrss php7 /var/lib/tt-rss-install/install-db.php
 
 ### Setup
 
-```
+```bash
 dokku plugin:install https://github.com/dokku/dokku-letsencrypt.git
 
 dokku config:set --no-restart ttrss DOKKU_LETSENCRYPT_EMAIL=todo@example.com
@@ -33,7 +33,7 @@ dokku ps:restart ttrss
 
 ### Renewal
 
-```
+```bash
 dokku plugins:upgrade letsencrypt
 dokku letsencrypt:auto-renew ttrss
 ```
@@ -44,7 +44,7 @@ dokku letsencrypt:auto-renew ttrss
 
 Check for updates in [config.php-dist](https://git.tt-rss.org/fox/tt-rss/commits/master/config.php-dist) and propagate them in `config.php`. In `Dockerfile`, update nginx base image and TTRSS release.
 
-```
+```bash
 dokku postgres:export ttrssdb_11_2 > ttrss.db
 git push dokku
 # go to Tiny Tiny RSS, it will ask to upgrade database, do it and check app is working
@@ -53,7 +53,7 @@ rm ttrss.db
 
 ### Database
 
-```
+```bash
 # upgrade from Postgres 10.2 to 11.2
 dokku plugins:upgrade postgres
 dokku postgres:clone ttrssdb_10_2 ttrssdb_11_2
@@ -64,4 +64,3 @@ dokku postgres:promote ttrssdb_11_2 ttrss
 dokku postgres:unlink ttrssdb_10_2 ttrss
 dokku postgres:destroy ttrssdb_10_2
 ```
-