The trick to make Travis use Go 1.10 is to use quotes :)

Author: jedisct1

.travis.yml

@@ -6,7 +6,7 @@ os:
   - linux
 
 go:
-  - 1.10rc2
+  - "1.10"
 
 script:
   - gimme --list
@@ -184,7 +184,7 @@ deploy:
   skip_cleanup: true
   on:
     repo: jedisct1/dnscrypt-proxy
-    condition: "${TRAVIS_GO_VERSION} == 1.10rc2"
+    condition: "${TRAVIS_GO_VERSION} == 1.10"
     tags: true
 
 after_deploy: