Add megacheck to gometalinter CircleCI target

See, https://github.com/dominikh/go-tools/tree/master/cmd/megacheck

.circleci/config.yml

@@ -85,12 +85,13 @@ jobs:
       - run: 'go get -u github.com/tsenart/deadcode'
       - run: 'go get -u github.com/jgautheron/goconst/cmd/goconst'
       - run: 'go get -u github.com/gordonklaus/ineffassign'
+      - run: 'go get -u honnef.co/go/tools/cmd/megacheck'
       - run: 'go get -u github.com/opennota/check/cmd/structcheck'
       - run: 'go get -u github.com/mdempsky/unconvert'
       - run: 'go get -u github.com/opennota/check/cmd/varcheck'
       - run:
           name: run linters
-          command: 'gometalinter --enable-gc --vendor --deadline 10m --disable-all --enable=deadcode --enable=goconst --enable=ineffassign --enable=structcheck --enable=unconvert --enable=varcheck ./...'
+          command: 'gometalinter --enable-gc --vendor --deadline 10m --disable-all --enable=deadcode --enable=goconst --enable=ineffassign --enable=megacheck --enable=structcheck --enable=unconvert --enable=varcheck ./...'
       - run:
           name: run go vet
           command: 'go vet ./pkg/...'