Work around https://github.com/eddyxu/cpp-coveralls/issues/108

.travis_coveralls.sh

@@ -1,5 +1,11 @@
 #!/bin/bash
 
 make check-coverage-libicu
-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`
+
 coveralls -t d9uGTP4NSD092kh2b85aDSsEDxatcYC6F --include src/