Added authorization bearer prefix for token

Inspired by c4998e2 by brunomperes on GitHub

Author: AndyObtiva

lib/api/sendpulse_api.rb

@@ -114,7 +114,7 @@ def send_request(path, method = 'GET', data = {}, use_token = true)
     http.use_ssl = true if @protocol == 'https'
 
     token = {}
-    token.merge!( 'authorization' => @token ) if use_token
+    token.merge!( 'Authorization' => "Bearer #{@token}" ) if use_token
 
     case method
       when 'POST'
@@ -637,4 +637,4 @@ def smtp_send_mail(email)
     send_request('smtp/emails', 'POST', data)
   end
 
-end
+end