Remove potentially unnecessary travis config parameters

Author: chclaus

.travis.yml

@@ -12,26 +12,6 @@ os:
 
 script: go install
 
-addons:
-  apt:
-    packages:
-    # needed for the nfpm pipe:
-    - rpm
-    # needed for the snap pipe:
-    - snapcraft
-
-env:
-# needed for the snap pipe:
-- PATH=/snap/bin:$PATH
-
-install:
-# needed for the snap pipe:
-- sudo snap install snapcraft --classic
-
-# needed for the docker pipe
-services:
-- docker
-
 # calls goreleaser
 deploy:
 - provider: script