Updated go to 1.4.3. Updated README.md

Signed-off-by: Federico Fissore <[email protected]>

Author: Federico Fissore

README.md

@@ -53,7 +53,7 @@ See [Doing continuous integration with arduino builder](https://github.com/ardui
 
 ### Building from source
                
-You need [Go 1.4.2](https://golang.org/dl/#go1.4.2).
+You need [Go 1.4.3](https://golang.org/dl/#go1.4.3).
 
 Repo root contains script `setup_go_env_vars`. Use it as is or as a template for setting up Go environment variables.
 
@@ -64,6 +64,7 @@ go get github.com/go-errors/errors
 go get github.com/stretchr/testify
 go get github.com/jstemmer/go-junit-report
 go get golang.org/x/codereview/patch
+go get golang.org/x/tools/cmd/vet
 go build
 ```