gotest: use stable version of metalinter

gotest.sh

@@ -85,15 +85,18 @@ lint_check() {
     print "* Run static checks"
 
     # Make sure gometalinter is installed and $GOPATH/bin is in your path.
-    if [ ! -x "$(type -p gometalinter)" ]; then
+    if [ ! -x "$(type -p gometalinter.v1)" ]; then
         print "** Install gometalinter"
-        go get -v github.com/alecthomas/gometalinter
-        gometalinter --install
+        go get -u gopkg.in/alecthomas/gometalinter.v1
+        gometalinter.v1 --install
     fi
 
+    # Update metalinter if needed.
+    gometalinter.v1 --install 1>/dev/null
+
     # Automatic checks
     linter_targets=$(glide novendor | grep -v lnrpc)
-    test -z "$(gometalinter --disable-all \
+    test -z "$(gometalinter.v1 --disable-all \
     --enable=gofmt \
     --enable=vet \
     --enable=golint \