Increment version number to 0.3.0

Author: t-kalinowski

DESCRIPTION

@@ -1,6 +1,6 @@
 Package: quickr
 Title: Compiler for R
-Version: 0.2.1.9000
+Version: 0.3.0
 Authors@R: c(
     person("Tomasz", "Kalinowski", , "tomasz@posit.co", role = c("aut", "cre")),
     person("Posit Software, PBC", role = c("cph", "fnd"),