Remove docker and fix YAML

I tried to figure out why builds are not running and somebody from
https://travis-ci.community/c/product hinted that invalid YAML can
bring those issues.

I run it through linter and found that asterisk needs to be escaped
or it will be treated as an alias, invalid alias in this case.
https://yaml.org/YAML_for_ruby.html#simple_alias_example

Also removed docker leftover from the previous commit.

Author: abitrolly

.travis.yml

@@ -4,8 +4,6 @@ addons:
   apt:
     packages:
     - snapcraft
-services:
-- docker
 python:
 - '2.7'
 - '3.3'
@@ -40,6 +38,6 @@ jobs:
       on:
         branch: master
       provider: snap
-      snap: *.snap
+      snap: "*.snap"
       channel: edge
       skip_cleanup: true