BLD: update to latest requests version

Author: lenak25

etc/python2.7-environment.yml

@@ -50,7 +50,7 @@ dependencies:
   - python-editor==1.0.3
   - pytz==2017.2
   - redo==2.0.1
-  - requests==2.18.4
+  - requests==2.20.1
   - requests-file==1.4.2
   - requests-ftp==0.3.1
   - six==1.11.0

etc/python3.6-environment-windows.yml

@@ -70,7 +70,7 @@ dependencies:
   - pysha3==1.0.2
   - python-editor==1.0.3
   - redo==2.0.1
-  - requests==2.18.4
+  - requests==2.20.1
   - requests-file==1.4.3
   - requests-ftp==0.3.1
   - requests-toolbelt==0.8.0

etc/python3.6-environment.yml

@@ -73,7 +73,7 @@ dependencies:
   - pysha3==1.0.2
   - python-editor==1.0.3
   - redo==2.0.1
-  - requests==2.18.4
+  - requests==2.20.1
   - requests-file==1.4.3
   - requests-ftp==0.3.1
   - requests-toolbelt==0.8.0

etc/requirements.txt

@@ -29,7 +29,7 @@ python-dateutil==2.7.3
 six==1.11.0
 
 # For fetching remote data
-requests==2.18.4
+requests==2.20.1
 
 Cython==0.27.3