Update README.md

fixed spelling error

README.md

@@ -11,7 +11,7 @@ An open-source python library built to empower developers to build applications
 
 ## ---------------------------------------------------
 ## ImageAI now uses **PyTorch** backend.
-As from ImageAI `3.0.2`, the library now uses PyTorch has the backend. For full details on this and if you plan on using existing Tensorflow pretrained models, custom models and Pascal VOC dataset, visit the [BACKEND_MIGRATION.md](BACKEND_MIGRATION.md) documentation.
+As from ImageAI `3.0.2`, the library now uses PyTorch as the backend. For full details on this and if you plan on using existing Tensorflow pretrained models, custom models and Pascal VOC dataset, visit the [BACKEND_MIGRATION.md](BACKEND_MIGRATION.md) documentation.
 ## ---------------------------------------------------
 
 ![](logo1.png)
@@ -303,4 +303,4 @@ You can cite **ImageAI** in your projects and research papers via the **BibTeX**
 [https://github.com/experiencor/keras-yolo3](https://github.com/experiencor/keras-yolo3)
  15. MobileNetV2: Inverted Residuals and Linear Bottlenecks
 [https://arxiv.org/abs/1801.04381](https://arxiv.org/abs/1801.04381)
- 16. YOLOv3 in PyTorch > ONNX > CoreML > TFLite [https://github.com/ultralytics/yolov3](https://github.com/ultralytics/yolov3)
+ 16. YOLOv3 in PyTorch > ONNX > CoreML > TFLite [https://github.com/ultralytics/yolov3](https://github.com/ultralytics/yolov3)