Scheduled monthly dependency update for July (#326)

* Update cython from 0.29.19 to 0.29.20

* Update numpy from 1.18.4 to 1.19.0

* Update dask from 2.17.2 to 2.19.0

* Update scipy from 1.4.1 to 1.5.0

* Update matplotlib from 3.2.1 to 3.2.2

* Update pandas from 1.0.4 to 1.0.5

requirements_dev.txt

@@ -1,12 +1,12 @@
 # required
-cython==0.29.19
-numpy==1.18.4
-dask[array]==2.17.2
+cython==0.29.20
+numpy==1.19.0
+dask[array]==2.19.0
 # optional
-scipy==1.4.1
-matplotlib==3.2.1
+scipy==1.5.0
+matplotlib==3.2.2
 seaborn==0.10.1
-pandas==1.0.4
+pandas==1.0.5
 scikit-learn==0.23.1
 h5py==2.10.0
 numexpr==2.7.1