libvisual: configure.ac: Bump version to 0.4.2

Author: hartwork

libvisual/configure.ac

@@ -4,7 +4,7 @@ AC_PREREQ(2.57)
 dnl Version numbers
 m4_define([libvisual_version_major], [0])
 m4_define([libvisual_version_minor], [4])
-m4_define([libvisual_version_micro], [1])
+m4_define([libvisual_version_micro], [2])
 
 m4_define([libvisual_version], [libvisual_version_major.libvisual_version_minor.libvisual_version_micro])