HighLine namespace fix (#177)

* Use HighLine in a way that does not pollute the global namespace

* version bump

Author: eeggers

CHANGELOG

@@ -1,3 +1,6 @@
+v1.5.6
+ - Modify usage of HighLine so that it does not pollute the global namespace
+
 v1.5.5
  - Add logging of an errored oauth2 response
 

VERSION

@@ -1 +1 @@
-1.5.5
+1.5.6

lib/spark_api/authentication/oauth2_impl/cli_provider.rb

@@ -1,4 +1,4 @@
-require "highline/import"
+require "highline"
 
 module SparkApi
   module Authentication
@@ -18,7 +18,7 @@ def initialize(credentials)
         def redirect(url)
           puts "Missing OAuth2 session, redirecting..."
           puts "Please visit #{url}, login as a user, and paste the authorization code here:"
-          self.code = ask("Authorization code?") do |q|
+          self.code = HighLine.ask("Authorization code?") do |q|
             q.whitespace = :strip_and_collapse
             q.validate = /^\w+$/
           end