minor README tweaks: use https in links and add badge

README.md

@@ -1,16 +1,16 @@
-# Laminar CI
+# Laminar CI [![status](https://ci.ohwg.net/badge/laminar.svg)](https://ci.ohwg.net/jobs/laminar)
 
-Laminar (http://laminar.ohwg.net) is a lightweight and modular Continuous Integration service for Linux. It is self-hosted and developer-friendly, eschewing a configuration UI in favor of simple version-controllable configuration files and scripts.
+Laminar (https://laminar.ohwg.net) is a lightweight and modular Continuous Integration service for Linux. It is self-hosted and developer-friendly, eschewing a configuration UI in favour of simple version-controllable configuration files and scripts.
 
 Laminar encourages the use of existing GNU/Linux tools such as `bash` and `cron` instead of reinventing them.
 
 Although the status and progress front-end is very user-friendly, administering a Laminar instance requires writing shell scripts and manually editing configuration files. That being said, there is nothing esoteric here and the [guide](http://laminar.ohwg.net/docs.html) should be straightforward for anyone with even very basic Linux server administration experience.
 
-See [the website](http://laminar.ohwg.net) and the [documentation](http://laminar.ohwg.net/docs.html) for more information.
+See [the website](https://laminar.ohwg.net) and the [documentation](https://laminar.ohwg.net/docs.html) for more information.
 
 ## Building from source
 
-First install development packages for `capnproto (0.7.0)`, `rapidjson`, `sqlite` and `boost-filesystem` from your distribution's repository or other source. Then:
+First install development packages for `capnproto (version 0.7.0 or newer)`, `rapidjson`, `sqlite` and `boost` (for the header-only `multi_index_container` library) from your distribution's repository or other source. Then:
 
 ```bash
 git clone https://github.com/ohwgiles/laminar.git