Merge pull request #48 from zhanghang1989/dependabot/pip/numpy-1.21.0

Bump numpy from 1.18.4 to 1.21.0

Author: zhanghang1989

requirements.txt

@@ -1,4 +1,4 @@
-numpy==1.18.4
+numpy==1.21.0
 opencv_python==4.2.0.32
 Pillow==9.0.0
 torch==1.5.0