Change release version to v3.0.6

Author: martinhsv

CHANGES

@@ -1,4 +1,4 @@
-v3.x.y - YYYY-MMM-DD (to be released)
+v3.0.6 - 2021-Nov-19
 -------------------------------------
 
   - Support configurable limit on depth of JSON parsing

headers/modsecurity/modsecurity.h

@@ -190,15 +190,15 @@ namespace modsecurity {
 
 #define MODSECURITY_MAJOR "3"
 #define MODSECURITY_MINOR "0"
-#define MODSECURITY_PATCHLEVEL "5"
+#define MODSECURITY_PATCHLEVEL "6"
 #define MODSECURITY_TAG ""
 #define MODSECURITY_TAG_NUM "100"
 
 #define MODSECURITY_VERSION MODSECURITY_MAJOR "." \
     MODSECURITY_MINOR "." MODSECURITY_PATCHLEVEL \
     MODSECURITY_TAG
 
-#define MODSECURITY_VERSION_NUM 3040100
+#define MODSECURITY_VERSION_NUM 3060100
 
 #define MODSECURITY_CHECK_VERSION(a) (MODSECURITY_VERSION_NUM <= a)