3.0 branch needs Go 1.9 or later

.travis.yml

@@ -1,9 +1,8 @@
 language: go
 go:
-  - "1.7.4"
-  - "1.8.3"
   - "1.9.4"
   - "1.10.1"
+  - "1.11.2"
   - tip
 
 before_install:

README.md

@@ -15,7 +15,7 @@ forum.
 ## Installation
 
 If you already have go installed, just run `go get` to install the Go
-dependencies. GeoDNS requires Go 1.8 or later.
+dependencies. GeoDNS requires Go 1.9 or later.
 
 If you don't have Go installed the easiest way to build geodns from source is to
 download Go from https://golang.org/dl/ and untar'ing it in