Update to go1.11

.travis.yml

@@ -1,6 +1,6 @@
 language: go
 go:
- - 1.7
+ - 1.11
 install:
  - go get github.com/constabulary/gb/...
  - go get github.com/golang/lint/golint

README.md

@@ -19,7 +19,7 @@ Go-NEB is a [Matrix](https://matrix.org) bot written in Go. It is the successor
 
 # Quick Start
 
-Clone and run (Requires Go 1.7+ and GB):
+Clone and run (Requires Go 1.11+ and GB):
 
 ```bash
 gb build github.com/matrix-org/go-neb