travis, appveyor: bump to Go 1.11.4

.travis.yml

@@ -156,7 +156,7 @@ matrix:
       git:
         submodules: false # avoid cloning ethereum/tests
       before_install:
-        - curl https://storage.googleapis.com/golang/go1.11.2.linux-amd64.tar.gz | tar -xz
+        - curl https://storage.googleapis.com/golang/go1.11.4.linux-amd64.tar.gz | tar -xz
         - export PATH=`pwd`/go/bin:$PATH
         - export GOROOT=`pwd`/go
         - export GOPATH=$HOME/go

appveyor.yml

@@ -23,8 +23,8 @@ environment:
 install:
   - git submodule update --init
   - rmdir C:\go /s /q
-  - appveyor DownloadFile https://storage.googleapis.com/golang/go1.11.2.windows-%GETH_ARCH%.zip
-  - 7z x go1.11.2.windows-%GETH_ARCH%.zip -y -oC:\ > NUL
+  - appveyor DownloadFile https://storage.googleapis.com/golang/go1.11.4.windows-%GETH_ARCH%.zip
+  - 7z x go1.11.4.windows-%GETH_ARCH%.zip -y -oC:\ > NUL
   - go version
   - gcc --version
 

internal/build/util.go

@@ -143,9 +143,9 @@ func CopyFile(dst, src string, mode os.FileMode) {
 // so that go commands executed by build use the same version of Go as the 'host' that runs
 // build code. e.g.
 //
-//     /usr/lib/go-1.11/bin/go run build/ci.go ...
+//     /usr/lib/go-1.11.4/bin/go run build/ci.go ...
 //
-// runs using go 1.11 and invokes go 1.11 tools from the same GOROOT. This is also important
+// runs using go 1.11.4 and invokes go 1.11.4 tools from the same GOROOT. This is also important
 // because runtime.Version checks on the host should match the tools that are run.
 func GoTool(tool string, args ...string) *exec.Cmd {
 	args = append([]string{tool}, args...)