PROTON-2318 Pin simplecov in .travis.yml to resolve gem conflict (#283)
diff --git a/.travis.yml b/.travis.yml
index 0917b0b..cd3ae5d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -155,7 +155,7 @@
- ${PYTHON} -m pip install --user --upgrade pip
- ${PYTHON} -m pip install --user coverage setuptools wheel tox virtualenv==20.0.23
# PROTON-2125 suppress annoying deprecation warning from Minitest in Ruby tests
-- gem install minitest:4.3.2 simplecov codecov
+- gem install minitest:4.3.2 simplecov:0.18.0 codecov
before_script:
- mkdir build
