update numpy version for point cloud deps (pandas)

Author: fracape

setup.py

@@ -134,7 +134,7 @@ def get_extra_requirements():
     python_requires=">=3.7",
     install_requires=[
         "einops",
-        "numpy",
+        "numpy>=1.21.0",
         "pandas",
         "scipy",
         "matplotlib",
@@ -151,7 +151,6 @@ def get_extra_requirements():
         "Intended Audience :: Developers",
         "Intended Audience :: Science/Research",
         "License :: OSI Approved :: BSD License",
-        "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",