bump version to v1.4.4b2

Author: mozman

src/ezdxf/version.py

@@ -24,5 +24,5 @@
 #   1. bug fix release beta0: VERSION = "0.9.1b0"; version = (0, 9, 1, 'b0')
 #   2. bug fix release: VERSION = "0.9.2"; version = (0, 9, 2, 'release')
 
-version = (1, 4, 4, "b1")
-__version__ = "1.4.4b1"
+version = (1, 4, 4, "b2")
+__version__ = "1.4.4b2"