Fix coverage

Author: d-frey

.travis.yml

@@ -126,7 +126,11 @@ matrix:
         - COMPILER=g++-6
         - CXXFLAGS="-O0 --coverage"
       before_script:
-        - pip install --user cpp-coveralls
+        - pip install --user urllib3[secure] cpp-coveralls
+        # Work around https://github.com/eddyxu/cpp-coveralls/issues/108 by manually
+        # installing the pyOpenSSL module and injecting it into urllib3 as per
+        # https://urllib3.readthedocs.io/en/latest/user-guide.html#ssl-py2
+        - sed -i -e '/^import sys$/a import urllib3.contrib.pyopenssl\nurllib3.contrib.pyopenssl.inject_into_urllib3()' $(which coveralls)
       after_success:
         - coveralls --gcov gcov-6 --gcov-options '\-lp' --exclude src