Add missing 'by'

src/debug.c

@@ -852,7 +852,7 @@ void sigsegvHandler(int sig, siginfo_t *info, void *secret) {
 
     redisLog(REDIS_WARNING,
 "\n=== REDIS BUG REPORT END. Make sure to include from START to END. ===\n\n"
-"       Please report the crash opening an issue on github:\n\n"
+"       Please report the crash by opening an issue on github:\n\n"
 "           http://github.com/antirez/redis/issues\n\n"
 "  Suspect RAM error? Use redis-server --test-memory to verify it.\n\n"
 );