Add CHANGELOG entries for 1.7.3, 1.8.3 and 1.9.3

CHANGELOG.md

+v 1.9.3
+- Fix package's scripts permissions !440
+- Check if directory exists before recreating it with Windows CMD !435
+
 v 1.9.2
 - Handle Content-Type header with charset information !430
 - Don't raise error if machines directory is missing on machines listing !433
@@ -36,6 +40,10 @@ v 1.9.0
 - Add a link where one can download the packages directly !292
 - Kubernetes executor - use pre-build container !425
 
+v 1.8.3
+- Fix package's scripts permissions !440
+- Check if directory exists before recreating it with Windows CMD !435
+
 v 1.8.2
 - Handle Content-Type header with charset information !430
 
@@ -59,6 +67,10 @@ v 1.8.0
 - Handle received 'failed' build state while patching the trace !366
 - Add support for using private docker registries !386
 
+v 1.7.3
+- Fix package's scripts permissions !440
+- Check if directory exists before recreating it with Windows CMD !435
+
 v 1.7.2
 - Handle Content-Type header with charset information !430