release: OpenCV 3.4.12

Author: alalek

modules/core/include/opencv2/core/version.hpp

@@ -8,7 +8,7 @@
 #define CV_VERSION_MAJOR    3
 #define CV_VERSION_MINOR    4
 #define CV_VERSION_REVISION 12
-#define CV_VERSION_STATUS   "-pre"
+#define CV_VERSION_STATUS   ""
 
 #define CVAUX_STR_EXP(__A)  #__A
 #define CVAUX_STR(__A)      CVAUX_STR_EXP(__A)