fixed issue where openid scope stopped working

in v0.9.1 scope with openid stopped working. this commit addresses this issue.

Author: jenksguo

lib/omniauth/strategies/xero_oauth2.rb

@@ -44,7 +44,7 @@ def id_token
       end
 
       def raw_info
-        if @id_token == nil
+        if access_token['id_token'] == nil
           @raw_info = {
             'xero_userid'=> '',
             'given_name' => '',

lib/xero-oauth2/version.rb

@@ -1,5 +1,5 @@
 module OmniAuth
   module XeroOauth2
-    VERSION = '0.9.1'
+    VERSION = '0.9.2'
   end
 end

omniauth-xero-oauth2.gemspec

@@ -1,6 +1,6 @@
 Gem::Specification.new do |s|
   s.name        = 'omniauth-xero-oauth2'
-  s.version     = '0.9.1'
+  s.version     = '0.9.2'
   s.licenses    = ['MIT']
   s.summary     = 'OAuth2 Omniauth strategy for Xero.'
   s.description = 'OAuth2 Omniauth straetgy for Xero API.'