.travis.yml in terraforming-0.13.2 vs .travis.yml in terraforming-0.14.0

@@ -1,10 +1,9 @@
 language: ruby
 rvm:
 - 2.4.1
 - 2.3.4
 - 2.2.7
-- 2.1.10
 env:
   global:
     - secure: n0mxwnyjuXI4mJO4mp++2TnsPJ+XgCF/J1U2L5piE5j3xMhSU+5V0JrA1uFlS0Pemb44M7BjgmF9S4G35BwyAQpctpCYhqy9tFa6+Y6nxEv5hCv2cZz7BSAZM6eb+zq20409hxTHRaQOr1DBeE4R5S2PrmOXRqvYfTRv3LNSLFk=
   matrix:
     - OJ=0