some minor updates in the readme

Author: mackuba

README.md

@@ -13,11 +13,13 @@ Accounts on Bluesky use identifiers like [did:plc:oio4hkxaop4ao4wz2pp3f4cr](http
 
 ## Installation
 
-From the command line:
+To use DIDKit, you need a reasonably new version of Ruby – it should run on Ruby 2.6 and above, although it's recommended to use a version that's still getting maintainance updates, i.e. currently 3.2+. A compatible version should be preinstalled on macOS Big Sur and above and on many Linux systems. Otherwise, you can install one using tools such as [RVM](https://rvm.io), [asdf](https://asdf-vm.com), [ruby-install](https://github.com/postmodern/ruby-install) or [ruby-build](https://github.com/rbenv/ruby-build), or `rpm` or `apt-get` on Linux (see more installation options on [ruby-lang.org](https://www.ruby-lang.org/en/downloads/)).
 
-    gem install didkit
+To install the gem, run in the command line:
 
-Or, add this to your `Gemfile`:
+    [sudo] gem install didkit
+
+Or add this to your app's `Gemfile`:
 
     gem 'didkit', '~> 0.3'
 
@@ -109,3 +111,5 @@ resolver.get_verified_handle(did)
 Copyright © 2025 Kuba Suder ([@mackuba.eu](https://bsky.app/profile/did:plc:oio4hkxaop4ao4wz2pp3f4cr)).
 
 The code is available under the terms of the [zlib license](https://choosealicense.com/licenses/zlib/) (permissive, similar to MIT).
+
+Bug reports and pull requests are welcome 😎