add readme pthread

diff --git a/readme.md b/readme.md
index 5fe8b5393cce9915766e7fa1bd62b33fd2ed3d61..613040787fab455391058933c1c8854459695080 100644 (file)
--- a/readme.md
+++ b/readme.md
@@ -14,6 +14,7 @@ It communicate with the scanner over the network. (RESTful API)
 - [json-c](https://json-c.github.io/json-c/json-c-current-release/doc/html/index.html) - parse response
 - [imagemagick](https://imagemagick.org/script/magick-core.php) - convert jpg to pnm
 - math - calc bytes per line
+- pthread  - heartbeat interval sleep
 
 ### Test dependencies