[Minor] Update version to 3.0 due to amount of changes

CMakeLists.txt

@@ -7,8 +7,8 @@
 ############################# INITIAL SECTION #############################################
 CMAKE_MINIMUM_REQUIRED(VERSION 3.12 FATAL_ERROR)
 
-SET(RSPAMD_VERSION_MAJOR 2)
-SET(RSPAMD_VERSION_MINOR 8)
+SET(RSPAMD_VERSION_MAJOR 3)
+SET(RSPAMD_VERSION_MINOR 0)
 
 # Keep two digits all the time
 SET(RSPAMD_VERSION_MAJOR_NUM ${RSPAMD_VERSION_MAJOR}0)