Gemfile: add base64, bigdecimal

If absent, these gems raise warnings.

Author: olleolleolle

CHANGELOG.md

@@ -10,6 +10,7 @@ Please visit [cucumber/CONTRIBUTING.md](https://github.com/cucumber/cucumber/blo
 
 ## [Unreleased]
 ### Changed
+- Added gems `base64`, `bigdecimal` to Gemfiile ([olleolleolle](https://github.com/olleolleolle))
 - Updated `cucumber-compatibility-kit` to v16 ([luke-hill](https://github.com/luke-hill))
 - Changed compatibility testing to fully lean on external assets instead of duplicating them ([luke-hill](https://github.com/luke-hill))
 

Gemfile

@@ -4,6 +4,8 @@ source 'https://rubygems.org'
 
 gemspec
 
+gem 'base64'
+gem 'bigdecimal'
 # To hack on Cucumber together with any of these libraries, uncomment the line below:
 # gem 'cucumber-core', path: '../cucumber-ruby-core'
 # gem 'cucumber-cucumber-expressions', path: '../cucumber-expressions/ruby'