Remove cocoapi dependency

Author: hovnatan

setup.py

@@ -26,7 +26,7 @@
             'superannotate/pycocotools_sa/maskApi.c',
             'superannotate/pycocotools_sa/_mask.pyx'
         ],
-        include_dirs=[np.get_include(), 'superannotate/pycocotools_sa/'],
+        include_dirs=[np.get_include(), 'superannotate/pycocotools_sa'],
         extra_compile_args=[],
     )
 ]