[travis] only build on 1.8.x and master, fix deploy

.travis.yml

@@ -1,8 +1,6 @@
 language: go
 go:
-  - 1.x
-  - 1.6
-  - 1.7.x
+  - 1.8.x
   - master
 
 install:
@@ -15,6 +13,7 @@ install:
   - GOOS=darwin GOARCH=amd64 go build -o release/bowser-create-account-darwin-amd64 github.com/b1naryth1ef/bowser/cmd/bowser-create-account
 
 deploy:
+  skip_cleanup: true
   provider: releases
   api_key:
     secure: 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
@@ -25,4 +24,4 @@ deploy:
     - release/bowser-create-account-darwin-amd64
   on:
     repo: b1naryth1ef/bowser
-    condition: $TRAVIS_GO_VERSION =~ ^1\.7\.[0-9]+$
+    condition: $TRAVIS_GO_VERSION =~ ^1\.8\.[0-9]+$