Change the version reporter to work on Python 3.
diff --git a/.travis.yml b/.travis.yml
index 12d08fe..f5db002 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -70,7 +70,7 @@
   - |
     coverage report -m
   - |
-    python -c "import OpenSSL.SSL; print OpenSSL.SSL.SSLeay_version(OpenSSL.SSL.SSLEAY_VERSION)"
+    python -c "import OpenSSL.SSL; print(OpenSSL.SSL.SSLeay_version(OpenSSL.SSL.SSLEAY_VERSION))"
 
 after_success:
     - coveralls