Update version to 1.11.18

Build/NuGet/.pack-version

@@ -1 +1 @@
-1.11.17
+1.11.18

lib/Common/ChakraCoreVersion.h

@@ -17,7 +17,7 @@
 // ChakraCore version number definitions (used in ChakraCore binary metadata)
 #define CHAKRA_CORE_MAJOR_VERSION 1
 #define CHAKRA_CORE_MINOR_VERSION 11
-#define CHAKRA_CORE_PATCH_VERSION 17
+#define CHAKRA_CORE_PATCH_VERSION 18
 #define CHAKRA_CORE_VERSION_RELEASE_QFE 0 // Redundant with PATCH_VERSION. Keep this value set to 0.
 
 // -------------