config: Fix missing core.user entry

The config file is missing an entry for core.user.  The core.user entry
is added but it is never written to the config.

Write the core.user entry to the config file.

Signed-off-by: Prarit Bhargava <[email protected]>

go.mod

@@ -1,37 +1,24 @@
 module github.com/zaquestion/lab
 
 require (
-	github.com/BurntSushi/toml v0.3.1 // indirect
 	github.com/acarl005/stripansi v0.0.0-20180116102854-5a71ef0e047d
 	github.com/avast/retry-go v0.0.0-20180319101611-5469272a8171
 	github.com/charmbracelet/glamour v0.1.1-0.20200114010931-28cbdae8e7a9
-	github.com/charmbracelet/glow v0.2.0 // indirect
-	github.com/davecgh/go-spew v1.1.1
-	github.com/derekparker/delve v1.1.0
+	github.com/dlclark/regexp2 v1.2.0 // indirect
 	github.com/gdamore/tcell v1.3.0
 	github.com/go-git/go-git/v5 v5.0.0
-	github.com/gopherjs/gopherjs v0.0.0-20181103185306-d547d1d9531e // indirect
-	github.com/inconshreveable/mousetrap v1.0.0 // indirect
-	github.com/jtolds/gls v4.2.1+incompatible // indirect
 	github.com/lunixbochs/vtclean v0.0.0-20180621232353-2d01aacdc34a
 	github.com/onsi/gomega v1.4.3 // indirect
 	github.com/pkg/errors v0.8.1
 	github.com/rivo/tview v0.0.0-20191129065140-82b05c9fb329
 	github.com/rsteube/carapace v0.0.16
-	github.com/sirupsen/logrus v1.2.0 // indirect
-	github.com/smartystreets/assertions v0.0.0-20180927180507-b2de0cb4f26d // indirect
-	github.com/smartystreets/goconvey v0.0.0-20181108003508-044398e4856c // indirect
 	github.com/spf13/cobra v1.0.0
 	github.com/spf13/pflag v1.0.5
 	github.com/spf13/viper v1.4.0
 	github.com/stretchr/testify v1.4.0
 	github.com/tcnksm/go-gitconfig v0.1.2
-	github.com/wadey/gocovmerge v0.0.0-20160331181800-b5bfa59ec0ad // indirect
 	github.com/xanzy/go-gitlab v0.33.1-0.20200713191942-71ea998bed24
-	golang.org/x/arch v0.0.0-20181203225421-5a4828bb7045 // indirect
 	golang.org/x/crypto v0.0.0-20200302210943-78000ba7a073
-	golang.org/x/tools v0.0.0-20191212224101-0f69de236bb7 // indirect
-	gopkg.in/DATA-DOG/go-sqlmock.v1 v1.3.0 // indirect
 )
 
 go 1.13