Return back allow failures for snapshot versions

Author: sergeyklay

.travis.yml

@@ -9,9 +9,10 @@ env:
     - EMACS_VERSION=emacs-26.2-travis
     - EMACS_VERSION=emacs-git-snapshot-travis
     - EMACS_VERSION=remacs-git-snapshot-travis
-# matrix:
-#   allow_failures:
-#   - env: EMACS_VERSION=emacs-git-snapshot-travis
+matrix:
+  fast_finish: true
+  allow_failures:
+    - env: EMACS_VERSION=emacs-git-snapshot-travis
 
 before_install:
   - export PATH="/home/travis/.evm/bin:$PATH"