message: Change version to 0.15.5
diff: /// Denotes version of CAF in the format {MAJOR}{MINOR}{PATCH},
  /// whereas each number is a two-digit decimal number without
  /// leading zeros (e.g. 900 is version 0.9.0).
  -#define CAF_VERSION 1504
  +#define CAF_VERSION 1505
  /// Defined to the major version number of CAF.
  #define CAF_MAJOR_VERSION (CAF_VERSION / 10000)
  