Upgrade pandas to <2.0.0 (#1603)

Author: vincentschen

requirements.txt

@@ -13,7 +13,7 @@ numpy>=1.16.0,<2.0.0
 scipy>=1.2.0,<2.0.0
 
 # Data storage and function application
-pandas>=0.25.0,<1.1.0
+pandas>=0.25.0,<2.0.0
 tqdm>=4.33.0,<5.0.0
 
 # Internal models

setup.py

@@ -38,7 +38,7 @@
         "munkres>=1.0.6",
         "numpy>=1.16.0,<2.0.0",
         "scipy>=1.2.0,<2.0.0",
-        "pandas>=0.25.0,<1.1.0",
+        "pandas>=0.25.0,<2.0.0",
         "tqdm>=4.33.0,<5.0.0",
         "scikit-learn>=0.20.2,<0.22.0",
         "torch>=1.2.0,<2.0.0",