Merge pull request #414 from odeits/patch-4

fix typo potentialy to potentially

include/spdlog/async_logger.h

@@ -61,7 +61,7 @@ public:
                  const std::function<void()>& worker_teardown_cb = nullptr);
 
     //Wait for the queue to be empty, and flush synchronously
-    //Warning: this can potentialy last forever as we wait it to complete
+    //Warning: this can potentially last forever as we wait it to complete
     void flush() override;
 
     // Error handler