Merge pull request #232 from trapexit/version

override standard libfuse version flag

src/option_parser.cpp

@@ -324,6 +324,7 @@ namespace mergerfs
           FUSE_OPT_KEY("-h",MERGERFS_OPT_HELP),
           FUSE_OPT_KEY("--help",MERGERFS_OPT_HELP),
           FUSE_OPT_KEY("-v",MERGERFS_OPT_VERSION),
+          FUSE_OPT_KEY("-V",MERGERFS_OPT_VERSION),
           FUSE_OPT_KEY("--version",MERGERFS_OPT_VERSION),
           {NULL,-1U,0}
         };