latest docker

Author: eugene-travis

.travis.yml

@@ -7,8 +7,14 @@ rvm: 2.6.5
 
 script: "bundle exec rake knapsack:rspec"
 
+addons:
+  - snaps:
+    - name: docker
+      channel: latest/beta
+
 env:
   global:
+    - PATH=/snap/bin:$PATH
     - RUBY_GC_MALLOC_LIMIT=90000000
     - RUBY_GC_HEAP_FREE_SLOTS=200000
     - CI_NODE_TOTAL=3