Bump versions of most dependencies (#679)

* Upgrade dependencies

* Bump go version to 1.15

* Bump golangci-lint to v1.34.1

* Bump versions in GitHub action

.github/workflows/ci.yml

@@ -77,7 +77,7 @@ jobs:
 
     - name: Upload binaries to the new release
       if: contains(github.ref, 'tags')
-      uses: svenstaro/upload-release-action@v1-release
+      uses: svenstaro/upload-release-action@v2
       with:
         repo_token: ${{ secrets.GITHUB_TOKEN }}
         file: out/krew.*

go.mod

@@ -1,24 +1,18 @@
 module sigs.k8s.io/krew
 
-go 1.14
+go 1.15
 
 require (
-	github.com/fatih/color v1.7.0
-	github.com/gogo/protobuf v1.2.1 // indirect
-	github.com/google/go-cmp v0.3.0
-	github.com/inconshreveable/mousetrap v1.0.0 // indirect
+	github.com/fatih/color v1.10.0
+	github.com/google/go-cmp v0.5.2
 	github.com/kylelemons/godebug v1.1.0 // indirect
-	github.com/mattn/go-colorable v0.1.2 // indirect
-	github.com/mattn/go-isatty v0.0.8
-	github.com/pkg/errors v0.8.0
-	github.com/sahilm/fuzzy v0.0.5
-	github.com/spf13/cobra v0.0.3
-	github.com/spf13/pflag v1.0.3
-	golang.org/x/net v0.0.0-20190628185345-da137c7871d7 // indirect
-	golang.org/x/sys v0.0.0-20190712062909-fae7ac547cb7 // indirect
-	gopkg.in/inf.v0 v0.9.1 // indirect
-	k8s.io/apimachinery v0.0.0-20190717022731-0bb8574e0887
-	k8s.io/client-go v7.0.0+incompatible
+	github.com/mattn/go-isatty v0.0.12
+	github.com/pkg/errors v0.9.1
+	github.com/sahilm/fuzzy v0.1.0
+	github.com/spf13/cobra v1.1.1
+	github.com/spf13/pflag v1.0.5
+	k8s.io/apimachinery v0.20.1
+	k8s.io/client-go v11.0.0+incompatible
 	k8s.io/klog v1.0.0
-	sigs.k8s.io/yaml v1.1.0
+	sigs.k8s.io/yaml v1.2.0
 )