Update numpy version to avoid error:

Beat Buesser · Beat Buesser · commit 0a6e3632a8aa · 2021-02-01T23:34:17.000Z
ValueError: numpy.ndarray size changed, may indicate binary incompatibility. Expected 88 from C header, got 80 from PyObject
Signed-off-by: Beat Buesser &lt;beat.buesser@ie.ibm.com&gt;
diff --git a/requirements.txt b/requirements.txt
@@ -1,5 +1,5 @@
 # base
-numpy==1.19.2
+numpy==1.20.0
 scipy==1.4.1
 matplotlib==3.3.3
 scikit-learn>=0.22.2,==0.23.*
