pycocotools git install fix

requirements.txt

@@ -10,7 +10,7 @@ pyyaml
 torchvision
 scipy
 tqdm
-'git+https://github.com/cocodataset/cocoapi.git#subdirectory=PythonAPI'
+git+https://github.com/cocodataset/cocoapi.git#subdirectory=PythonAPI
 
 # Nvidia Apex (optional) for mixed precision training --------------------------
 # git clone https://github.com/NVIDIA/apex && cd apex && pip install -v --no-cache-dir --global-option="--cpp_ext" --global-option="--cuda_ext" . --user && cd .. && rm -rf apex