update readme

Author: jethrodaniel

README.md

@@ -6,10 +6,16 @@ The main use-case is to allow using UUIDs as primary keys with SQLite in [Rails]
 
 ## Installation
 
-Add this to your `Gemfile`:
+Add this gem to your application's `Gemfile`, by running this:
+
+```
+bundle add sqlite_extensions-uuid
+```
+
+or by manually adding this line and running `bundle`:
 
 ```ruby
-gem "sqlite_extensions-uuid", github: "jethrodaniel/sqlite_extensions-uuid"
+gem "sqlite_extensions-uuid"
 ```
 
 In your Rails app, you'll need to load the extension in your `config/database.yml` like so:

sqlite_extensions-uuid.gemspec

@@ -11,8 +11,6 @@ Gem::Specification.new do |spec|
   spec.license = "MIT"
   spec.required_ruby_version = ">= 3.0.0"
 
-  # spec.metadata["allowed_push_host"] = "TODO: Set to your gem server 'https://example.com'"
-
   spec.files = %w[
     lib/sqlite_extensions/uuid.rb
     ext/sqlite_extensions/uuid/sqlite3ext.h