0.20.7 -> 0.20.8

updated the progressbar2, need to push to pipy and conda-forge

Author: alexlib

setup.py

@@ -68,7 +68,7 @@
 
 
 setup(  name = "OpenPIV",
-        version = "0.20.7",
+        version = "0.20.8",
         author = "OpenPIV contributors",
         author_email = "[email protected]",
         description = "An open source software for PIV data analysis",