travis: fix go modules bug

Travis is running pre-scripts to go get everything without go modules
enabled. Moving environment variable to `env` section.

There was a typo in the scripts section when setting GO111MODULE.

Author: smyrman

.travis.yml

@@ -2,6 +2,8 @@ language: go
 go:
   - 1.11
   - tip
+env:
+  - GO111MODULE=on
 cache:
   directories:
     - $HOME/.cache/go-build
@@ -10,6 +12,6 @@ matrix:
   allow_failures:
     - go: tip
 script:
-  - env GO111MODULE=on go build ./...
-  - env GO111MODUKE=on go test -v -race -cpu=1,2,4 ./...
-  - env GO111MODUKE=on go test -v -race -cpu=1,2,4 ./examples/...
+  - go build ./...
+  - go test -v -race -cpu=1,2,4 ./...
+  - go test -v -race -cpu=1,2,4 ./examples/...