Upgrade highline gem

Author: John Tuttle

CHANGELOG.md

@@ -6,6 +6,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+### Fixed
+- Upgraded `highline` dependency to fix deprecation warning.
+  [cyberark/conjur-cli#330](https://github.com/cyberark/conjur-cli/pull/330)
+
 ## [6.2.4] - 2021-07-01
 ### Changed
 - Upgraded `conjur-api` dependency to 5.3.5.

Gemfile

@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-#ruby=ruby-2.2.5
+#ruby=ruby-2.7.0
 #ruby-gemset=conjur-cli
 
 # Specify your gem's dependencies in conjur.gemspec

conjur-cli.gemspec

@@ -25,7 +25,7 @@ Gem::Specification.new do |gem|
   gem.add_dependency 'conjur-api', '~> 5.3'
   gem.add_dependency 'deep_merge', '~> 1.0'
   gem.add_dependency 'gli', '>=2.8.0'
-  gem.add_dependency 'highline', '~> 1.7'
+  gem.add_dependency 'highline', '~> 2.0'
   gem.add_dependency 'netrc', '~> 0.10'
   gem.add_dependency 'table_print', '~> 1.5'
   gem.add_dependency 'xdg', '= 2.2.3'