Enable missing comment lint check disabled by default from golangci-lint (#13)

* Enable missing comment lint check disabled by default from golangci-lint

Author: psampaz

.golangci.yml

@@ -57,6 +57,7 @@ issues:
     - text: "weak cryptographic primitive"
       linters:
         - gosec
+  exclude-use-default: false
 
 # golangci.com configuration
 # https://github.com/golangci/golangci/wiki/Configuration

internal/mod/mod.go

@@ -1,3 +1,4 @@
+// Package mod provides functionality around modules
 package mod
 
 import (

internal/runner/runner.go

@@ -1,3 +1,4 @@
+// Package runner is responsible for running the command and rendering the output
 package runner
 
 import (
@@ -11,6 +12,7 @@ import (
 	"github.com/olekukonko/tablewriter"
 )
 
+// OsExit is use here in order to simplify testing
 var OsExit = os.Exit
 
 // Run converts the the json output of go list -u -m -json all to table format

main.go

@@ -1,3 +1,4 @@
+// Package main is the entry point of the go-mod-outdated tool
 package main
 
 import (