[appveyor/travis] Add test dependencies

Author: mpsonntag

.travis.yml

@@ -75,7 +75,7 @@ install:
       export PIPCMD=pip;
     fi;
 
-  - $PIPCMD install lxml enum34 pyyaml rdflib
+  - $PIPCMD install lxml enum34 pyyaml rdflib owlrl requests
 
 script:
   - which $PYCMD

appveyor.yml

@@ -37,7 +37,7 @@ init:
 build: false
 
 install:
-  - python -m pip install lxml enum34 pyyaml rdflib owlrl
+  - python -m pip install lxml enum34 pyyaml rdflib owlrl requests
 
 test_script:
   - python --version