feat(gometalinter): Move to versioned releases

gometalinter has moved to versioned releases. The latest of the v1
major versioned releases can be retrieved through pkg.in. This
change moves gometalinter use to the latest v1 release.

scripts/validate-go.sh

@@ -17,15 +17,15 @@ set -euo pipefail
 
 exit_code=0
 
-if ! hash gometalinter 2>/dev/null ; then
-  go get github.com/alecthomas/gometalinter
-  gometalinter --install
+if ! hash gometalinter.v1 2>/dev/null ; then
+  go get -u gopkg.in/alecthomas/gometalinter.v1
+  gometalinter.v1 --install
 fi
 
 echo
 echo "==> Running static validations <=="
 # Run linters that should return errors
-gometalinter \
+gometalinter.v1 \
   --disable-all \
   --enable deadcode \
   --severity deadcode:error \
@@ -42,7 +42,7 @@ gometalinter \
 echo
 echo "==> Running linters <=="
 # Run linters that should return warnings
-gometalinter \
+gometalinter.v1 \
   --disable-all \
   --enable golint \
   --vendor \