[Tests] remove v16.8 tests from allowed failures

Author: AlokTakshak

.travis.yml

@@ -93,10 +93,6 @@ matrix:
       env: KARMA=true REACT=15
     - node_js: "6"
       env: KARMA=true REACT=16
-    - node_js: "lts/*"
-      env: REACT=16.8.5 RENDERER=16.8.3
-    - node_js: "lts/*"
-      env: REACT=16.8 RENDERER=16.7
   exclude:
     - node_js: "6"
       env: REACT=0.13