Upgrade to go 1.10.1 in travis CI

.travis.yml

@@ -1,22 +1,13 @@
 language: go
 go:
-  - 1.6
+  - 1.10.1
 
 env:
-  - "MY_GOOS=linux MY_GOARCH=amd64"
-  - "MY_GOOS=darwin MY_GOARCH=amd64"
-  - "MY_GOOS=windows MY_GOARCH=amd64"
+  - "GIMME_OS=linux GIMME_ARCH=amd64"
+  - "GIMME_OS=darwin GIMME_ARCH=amd64"
+  - "GIMME_OS=windows GIMME_ARCH=amd64"
 
 before_install:
-# workaround for travis-ci/gimme#42
-  - curl -o go.tar.gz -sL https://storage.googleapis.com/golang/go1.7.3.linux-amd64.tar.gz
-  - tar -C $HOME -xf go.tar.gz
-  - rm go.tar.gz
-  - export GOROOT="${HOME}/go"
-  - export PATH="${GOROOT}/bin:${PATH}"
-  - export GOOS="${MY_GOOS}"
-  - export GOARCH="${MY_GOARCH}"
-# end of workaround ###
   - go get github.com/axw/gocov/gocov
   - go get github.com/mattn/goveralls
   - go get golang.org/x/tools/cmd/cover
@@ -27,7 +18,7 @@ install:
 
 script:
   - "go install -v ./..."
-  - "if test $GOOS.$GOARCH = linux.amd64; then ${GOPATH}/bin/gotestcover -v -coverprofile=coverage.report ./...; go tool cover -func=coverage.report; fi"
+  - "if test $GIMME_OS.$GIMME_ARCH = linux.amd64; then ${GOPATH}/bin/gotestcover -v -coverprofile=coverage.report ./...; go tool cover -func=coverage.report; fi"
 
 after_script:
   - "$HOME/gopath/bin/goveralls -coverprofile=coverage.report -service=travis-ci"