remove duplicate requirement with paddlepaddle (#32)

requirements.txt

-numpy>=1.12, <=1.16.4 ; python_version<"3.5"
-numpy>=1.12 ; python_version>="3.5"
 scikit-learn<=0.20 ; python_version<"3.5"
 scikit-learn ; python_version>="3.5"
-scipy>=0.19.0, <=1.2.1 ; python_version<"3.5"
-scipy ; python_version>="3.5"
-Pillow
 sklearn
 easydict
-six
 paddlepaddle-gpu>=1.6.2

setup.py

@@ -23,16 +23,10 @@ from plsc.version import plsc_version
 
 
 REQUIRED_PACKAGES = [
-    'numpy>=1.12,<=1.16.4;python_version<"3.5"',
-    'numpy>=1.12;python_version>="3.5"',
     'scikit-learn<=0.20;python_version<"3.5"',
     'scikit-learn;python_version>="3.5"',
-    'scipy>=0.19.0,<=1.2.1;python_version<"3.5"',
-    'scipy;python_version>="3.5"',
     'sklearn',
     'easydict',
-    'Pillow',
-    'six'
 ]