fix build: update .drone.yml and .travis.yml

Author: haya14busa

.drone.sec

@@ -1 +1 @@
-eyJhbGciOiJSU0EtT0FFUCIsImVuYyI6IkExMjhHQ00ifQ.0oFEs0rWuFWbIrnL8syhyK3duLSLvDmGsv0xkiD9OAXbsjaZWKmRUgi4rKw_FObLwDkC1x5L5NB-ByiBbUwNhyosjlEVDp458xEXUCYlcwcnr1RbOG9W07EiQCTgl61Tvdq-dS759GuefpzWu3TzuQw-iTKNKbtHZrs1dlxl1sGl0FLM7oHEv4O8beAAjTH7ltC-KNmowFWWeqONb6A_dxonOSWiNZVGzHjqiVrzMc5uVEBeZYi9fLwrDUB2CIUkPhLZKFI3WKDxcDTWH3spi64zrvYo6Gdy9eCKHYJc-qciBeBCNtAoFRNdOWsa6ZnfmWa_RNwkvAlk8uTJn0IYbQ.dpPUBDj_1mWbEK8g.D2LXfkxlmCTVZIRTNVN7AX-sx0UwQ1BnF1MdRuCyZ1XnMAYdIz-hxjSH3zJop8pRN012hCt7xeBM63cyIM7JMleGxmRJYij7mkxgPQ6p_4ibHbymyoseHMue0Kxg0bAw32F_F6FiBVF_wMUxkz0Oj745CAZ7r_zc4Le8csvLZl7h08WDL03a7CCTL4xbgMUOM-ZA8d3N27A3Xpdzvy9k.FSpfgFLnLcL9tjjAuoM_Iw
+eyJhbGciOiJSU0EtT0FFUCIsImVuYyI6IkExMjhHQ00ifQ.fkWEl5SfcCEntdIFAB5yO4F91yx5a4jXdHvzgzY25HLo4dxGfCdFCrOGQKCNCulX4czQRaxXvESz-Dwki-lAh-TTeMuHSU0Xje7rPY4o0txxB1zrlKGrZ5-36izJB92doxOTNm-NWVxnsAlGzVECbgWMCDg154g-sypof8hCN7My6JXQ-Y815rGultkAID60rUgg4dsSMXiP5mWBqktUtKs-pwDwwWeRWpASdufTshkbwjxJzJsRpTFdJCRzgOpEeP7Z07IcFZE8vHb0tMWSLDJShOTtGjR3Dz881MrUbGoPvQv9Jg8DVNeKcQHSKKU7qa0e-zNGzBjULhd0mE4HZw.ygbdZZeyGiwm7LWt.NwFVXqKdHkl55Dn45TZgToblcbJWw6pACeAIetuSG4M-FY2ZSgpruEC-M9oktIqoRrhSShjyjLBmdrTaKUyj5k8WyF0xGR2T2rbZ9Mn9IFmNzzM0pNNfCvNAN5CpIUBNboX-L-_6DsAFAfekEkUBQYvArDhA8WE2pq7udUnr8u0n00MG1gcuT98mtSzovZCe1z57AdmItqazILYZuB-x.8IxWXoXOvzqtFh_fNn069A

.drone.yml

@@ -14,7 +14,7 @@ build:
     commands:
       - go get github.com/haya14busa/reviewdog/cmd/reviewdog
       - go get github.com/golang/lint/golint
-      - go get honnef.co/go/unused/cmd/unused
+      - go get honnef.co/go/tools/cmd/unused
       - |
         go tool vet -all -shadowstrict . 2>&1 | reviewdog -f=govet -ci=droneio
       - |

.travis.yml

@@ -6,9 +6,6 @@ go:
 
 install:
   - go get -d -v -t ./...
-  - go get github.com/mattn/goveralls
-  - go get github.com/golang/lint/golint
-  - go get honnef.co/go/unused/cmd/unused
   - go get github.com/haya14busa/goverage
   - go get github.com/haya14busa/gosum/cmd/gosumcheck