ndsi_backend: Require ndsi >= 0.4

pupil_src/shared_modules/video_capture/ndsi_backend.py

@@ -19,7 +19,7 @@
 
 try:
     from ndsi import __version__
-    assert __version__ >= '0.3.5'
+    assert __version__ >= '0.4'
     from ndsi import __protocol_version__
 except (ImportError, AssertionError):
     raise Exception("pyndsi version is to old. Please upgrade")