update requirements.txt

add tensorflow-gpu version
add --no-binary flag for Shapely. This is needed to get cartopy running

requirements.txt

@@ -49,11 +49,13 @@ PyYAML==5.3
 requests==2.23.0
 scipy==1.4.1
 seaborn==0.10.0
+--no-binary shapely Shapely==1.7.0
 Shapely==1.7.0
 six==1.11.0
 statsmodels==0.11.1
-tensorboard==1.12.2
-tensorflow==1.12.0
+tensorboard==1.13.1
+tensorflow-estimator==1.13.0
+tensorflow-gpu==1.13.1
 termcolor==1.1.0
 toolz==0.10.0
 urllib3==1.25.8