Update .travis.yml

Author: esbanarango

.travis.yml

@@ -22,8 +22,6 @@ env:
 jobs:
   fail_fast: true
   allow_failures:
-      env: EMBER_TRY_SCENARIO=ember-lts-2.16
-    - env: EMBER_TRY_SCENARIO=ember-lts-2.18
     - env: EMBER_TRY_SCENARIO=ember-canary
 
   include:
@@ -39,8 +37,6 @@ jobs:
     # we recommend new addons test the current and previous LTS
     # as well as latest stable release (bonus points to beta/canary)
     - stage: "Additional Tests"
-      env: EMBER_TRY_SCENARIO=ember-lts-2.16
-    - env: EMBER_TRY_SCENARIO=ember-lts-2.18
     - env: EMBER_TRY_SCENARIO=ember-release
     - env: EMBER_TRY_SCENARIO=ember-beta
     - env: EMBER_TRY_SCENARIO=ember-canary