Upgrade to Go 1.17 (#71)

Changes to go.mod are based on running

    go mod tidy -go=1.17

This enables some of the new dependency features of Go 1.17

.travis.yml

@@ -1,7 +1,7 @@
 language: go
 
 go:
-- "1.16.x"
+- "1.17"
 
 script: |
   echo "Build shuttle" &&

go.mod

@@ -1,6 +1,6 @@
 module github.com/lunarway/shuttle
 
-go 1.15
+go 1.17
 
 require (
 	github.com/Masterminds/sprig/v3 v3.2.2
@@ -13,3 +13,20 @@ require (
 	github.com/stretchr/testify v1.7.0
 	gopkg.in/yaml.v2 v2.4.0
 )
+
+require (
+	github.com/Masterminds/goutils v1.1.1 // indirect
+	github.com/Masterminds/semver/v3 v3.1.1 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/google/uuid v1.1.1 // indirect
+	github.com/huandu/xstrings v1.3.1 // indirect
+	github.com/imdario/mergo v0.3.11 // indirect
+	github.com/inconshreveable/mousetrap v1.0.0 // indirect
+	github.com/mitchellh/reflectwalk v1.0.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/shopspring/decimal v1.2.0 // indirect
+	github.com/spf13/cast v1.3.1 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	golang.org/x/crypto v0.0.0-20200414173820-0848c9571904 // indirect
+	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect
+)