requirements: Update requests to 2.11.1

- Fixed a bug when using iter_content with decode_unicode=True for
  streamed bodies would raise AttributeError. This bug was introduced in
  2.11.
- Strip Content-Type and Transfer-Encoding headers from the header block
  when following a redirect that transforms the verb from POST/PUT to
  GET.

misc/requirements/requirements-codecov.txt

@@ -2,4 +2,4 @@
 
 codecov==2.0.5
 coverage==4.2
-requests==2.11.0
+requests==2.11.1

misc/requirements/requirements-pylint-master.txt

@@ -6,6 +6,6 @@ lazy-object-proxy==1.2.2
 mccabe==0.5.2
 -e git+https://github.com/PyCQA/pylint.git#egg=pylint
 ./scripts/dev/pylint_checkers
-requests==2.11.0
+requests==2.11.1
 six==1.10.0
 wrapt==1.10.8

misc/requirements/requirements-pylint.txt

@@ -7,7 +7,7 @@ lazy-object-proxy==1.2.2
 mccabe==0.5.2
 pylint==1.6.4
 ./scripts/dev/pylint_checkers
-requests==2.11.0
+requests==2.11.1
 six==1.10.0
 uritemplate.py==0.3.0
 wrapt==1.10.8