Add "go mod verify" to build scripts

.circleci/config.yml

@@ -17,6 +17,7 @@ jobs:
                 cd hugo
                 go mod download
                 sleep 5
+                go mod verify
                 go test -p 1 ./...
       - persist_to_workspace:
           root: .

.travis.yml

@@ -64,7 +64,8 @@ install:
   - go get github.com/magefile/mage
 
 script:
-  - go mod download || true
+  - go mod download
+  - go mod verify
   - mage -v test
   - if [ "$TRAVIS_ARCH" = "amd64" ]; then
         mage -v check;