Force unzipped body encoding to UTF-8

Author: jimmellor

lib/intercom/request.rb

@@ -105,7 +105,7 @@ def set_rate_limit_details(response)
 
     def decode(content_encoding, body)
       return body if (!body) || body.empty? || content_encoding != 'gzip'
-      Zlib::GzipReader.new(StringIO.new(body)).read
+      Zlib::GzipReader.new(StringIO.new(body)).read.force_encoding("utf-8")
     end
 
     def raise_errors_on_failure(res)