libobs: Update version to 0.15.0

libobs/obs-config.h

@@ -34,14 +34,14 @@
  *
  * Reset to zero each major version
  */
-#define LIBOBS_API_MINOR_VER  14
+#define LIBOBS_API_MINOR_VER  15
 
 /*
  * Increment if backward-compatible bug fix
  *
  * Reset to zero each major or minor version
  */
-#define LIBOBS_API_PATCH_VER  2
+#define LIBOBS_API_PATCH_VER  0
 
 #define MAKE_SEMANTIC_VERSION(major, minor, patch) \
                              ((major << 24) | \