Fixed build on python 2

Author: Sylvain MARIE

.travis.yml

@@ -20,13 +20,15 @@ before_install:
   # (a) linux dependencies
   - sudo apt-get install pandoc
   - sudo apt-get install ant
-  - sudo apt-get install ant-optional
+  - sudo apt-get install ant-optional  # for junitreports
 
 install:
   - pip list
   # needs to be installed beforehand
   - pip install setuptools_scm
   - python ci_tools/py_install.py pip ci_tools/requirements-pip.txt
+  # this does not work anymore on python 2 so lets only do it when needed
+  - if [ "${TRAVIS_PYTHON_VERSION}" = "3.5" ]; then pip install mkdocs-material mkdocs; fi;
   - |
     if [ "${TRAVIS_PYTHON_VERSION}" = "2.7" ]; then
       echo "No need to install enforce pytypes checktypes BUT need to install future"

ci_tools/requirements-pip.txt

@@ -26,5 +26,6 @@ pytest-html==1.9.0  # otherwise requires pytest 5
 xunitparser
 
 # --- to generate the doc (see .travis)
-mkdocs-material  #==3.3.0
-mkdocs  # ==1.0.4  # this is to prevent a version non-compliant with mkdocs-material to be installed.
+# does not work anymore on python 2
+# mkdocs-material  # ==2.7.3
+# mkdocs  # ==0.17.3  # this is to prevent a version non-compliant with mkdocs-material to be installed.