remove support for Go < 1.13 and dep

With `ghw` v1.0, support for `dep` and Go <1.13 is removed.

.travis.yml

@@ -8,36 +8,17 @@ script:
   - go run cmd/ghwc/main.go
 env:
   - GHW_TESTING_SKIP_GPU=1
+  - GO111MODULE="on"
 matrix:
   include:
-    # On Go 1.10 and Go 1.11, use dep to ensure dependencies before running go
-    # test.
-    - os: linux
-      go: "1.10"
-      install:
-        - go get -u github.com/golang/dep/cmd/dep
-        - dep ensure -v
-    - os: linux
-      go: "1.11"
-      install:
-        - go get -u github.com/golang/dep/cmd/dep
-        - dep ensure -v
-    # On Go >=1.12, use go modules to ensure dependencies instead of dep
-    - os: linux
-      go: "1.12"
-      env: GO111MODULE=on
     - os: linux
       go: "1.13"
-      env: GO111MODULE=on
     - os: linux
       go: "1.14.x"
-      env: GO111MODULE=on
 
     # Tests that ghw builds on MacOSX (even though there is currently only
     # support for block devices)
     #- os: osx
-    #  go: "1.12"
-    #  env: GO111MODULE=on
-    #- os: osx
     #  go: "1.13"
-    #  env: GO111MODULE=on
+    #- os: osx
+    #  go: "1.14.x"

Makefile

@@ -2,20 +2,12 @@ VENDOR := vendor
 PKGS := $(shell go list ./... | grep -v /$(VENDOR)/)
 SRC = $(shell find . -type f -name '*.go' -not -path "*/$(VENDOR)/*")
 BIN_DIR := $(GOPATH)/bin
-DEP := $(BIN_DIR)/dep
 GOMETALINTER := $(BIN_DIR)/gometalinter
 
 .PHONY: test
 test: vet
 	go test $(PKGS)
 
-$(DEP):
-	go get -u github.com/golang/dep/cmd/dep
-
-.PHONY: dep
-dep: $(DEP)
-	$(DEP) ensure
-
 $(GOMETALINTER):
 	go get -u github.com/alecthomas/gometalinter
 	$(GOMETALINTER) --install &> /dev/null