Update requirements.txt

Author: yvan674

requirements.txt

@@ -62,7 +62,7 @@ openssl=1.1.1c=h7b6447c_1
 pandas=0.24.2=pypi_0
 patsy=0.5.1=pypi_0
 pcre=8.43=he6710b0_0
-pillow=6.0.0=py37h34e0f95_0
+pillow>=6.2.2=py37h34e0f95_0
 pip=19.1.1=py37_0
 pycparser=2.19=py37_0
 pydensecrf=1.0rc2=pypi_0