.travis.yml in pycall-1.0.3 vs .travis.yml in pycall-1.1.0.rc1

- old
+ new

@@ -5,13 +5,14 @@
 dist: trusty
 sudo: required
 
 rvm:
 - ruby-head
-- 2.4.2
+- 2.5.0
+- 2.4.3
 - 2.3.5
-- 2.2.8
+- 2.2.9
 - 2.1.10
 
 env:
   global:
   - PYCALL_DEBUG_FIND_LIBPYTHON=1
@@ -37,11 +38,13 @@
   - os: osx
     osx_image: xcode9
     compiler: clang
     rvm: 2.4.1
     env: PYENV_VERSION=miniconda3-4.3.11
-  allow_failure:
+  allow_failures:
   - os: osx
+  - rvm: 2.2.9
+  - rvm: 2.1.10
 
 before_install:
 - gem update --system
 - gem update bundler
 - export PATH="$(pyenv root)/bin:$PATH"