Update CMakeLists.txt for 53.15

Author: ab9rf

CMakeLists.txt

@@ -7,8 +7,8 @@ cmake_policy(SET CMP0074 NEW)
 set(CMAKE_INSTALL_MESSAGE "LAZY")
 
 # set up versioning.
-set(DF_VERSION "53.14")
-set(DFHACK_RELEASE "r2")
+set(DF_VERSION "53.15")
+set(DFHACK_RELEASE "r1")
 set(DFHACK_PRERELEASE FALSE)
 
 set(DFHACK_VERSION "${DF_VERSION}-${DFHACK_RELEASE}")