update requirements to get cartopy running

requirements.txt

 Keras==2.2.4
-numpy==1.15.4
+numpy==1.18.1
 tensorflow==1.12.0
-xarray==0.14.0
-pandas==0.25.1
-requests==2.22.0
-pytest==5.2.1
-pytest-lazy-fixture==0.6.1
+xarray==0.15.0
+pandas==1.0.1
+requests==2.23.0
+pytest==5.3.5
+pytest-lazy-fixture==0.6.3
 pytest-cov
 pytest-html
 pydot
 mock
 statsmodels
 seaborn
-dask==0.20.2
+dask==2.11.0
 toolz  # for dask
 cloudpickle  # for dask
-cython==0.29.14
+cython==0.29.15
 pyshp
 six
 pyproj
 shapely
-Cartopy==0.16.0
+Cartopy==0.17.0
 matplotlib
 pillow
 scipy
\ No newline at end of file