Increment version number to 0.2.0.9000

DESCRIPTION

 Package: simulateDCE
 Title: Simulate data for discrete choice experiments 
-Version: 0.2.0
+Version: 0.2.0.9000
 Authors@R: 
     person(given = "Julian", family = "Sagebiel", email = "julian.sagebiel@idiv.de", role = c("aut", "cre"),
            comment = c(ORCID = "0000-0002-0253-6875"))

NEWS.md

+# simulateDCE (development version)
+
 # simulateDCE 0.2.0
 
 * readdesign can now guess the designtype. This is useful when you use sim_all and have both ngene and spdesign design files in your design folder.