update requirements.txt

Author: oaksharks

requirements.txt

@@ -3,6 +3,7 @@ hypernets>=0.2.5.1, <0.2.6
 sktime>=0.8.1
 prophet==1.0.1
 statsmodels>=0.12.1
-numpy>=1.16.5
+numpy>=1.16.5,<1.22
 pandas>=0.25.3
-scikit-learn>=0.22.1
+scikit-learn>=0.22.1
+scipy<1.8.0

setup.py

@@ -70,6 +70,7 @@ def execfile(fname, globs, locs=None):
         'Intended Audience :: Education',
         'Intended Audience :: Science/Research',
         'Programming Language :: Python',
+        'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
         'Topic :: Scientific/Engineering',